is it easy for malaysian to get an IT job there?

you wont get rich is sydney just by 120k unless you have very good saving plan. like eat cheap. live cheap.

but u get government benefit better than in Malaysia. of course you pay high tax in aussie for that.

What kind of commitments do you have in MY? Coming to AU alone or with family?

Like what Gary said, taxes here will make you miss earning in Msia. Also, just because there are jobs advertised does not mean you'll be the one to get it. Best case scenario is that you are coming over with a job confirmed.

That way transitioning is easiest, and you don't have to go jobless for months trying to survive. We survived on Hungry Jack's AUD10 for 2 burgers, 2 small fries & 2 drinks for about 4-5 months when we had to eat out. This sort of thing makes you miss the life you had back in Msia.

I would say temper your expectations if you do choose to migrate, because it may not be easy, and most of the messages here usually paint a clear picture for you to understand what you may go through starting from the bottom again.
If you're earning RM100k++ now, what is motivating you to move?

Like what many have said, you won't get rich living and spending based on $120k p.a but it isn't that bad either. It's a good starting salary for a migrant, depending on your circumstances ie. single or with partner or with family and your current job experience. I would put it as average for a mid-level exec for example.

We were lucky enough to be paid more than our last paid salary in MYR when we got here a couple of years ago which basically means after-tax salary is > than MYR (dollar-to-dollar terms) despite the higher tax rate over here. That made the transitioning so much easier and pretty much a no brainer in terms of career progression and lifestyle.

You're probably looking to c. $6-6.5k net after tax, so subject to your expenses you can work it out from there how much you get to save every month.

In the event that you landed a 150K job, then it's really a no-brainer whether it's worth it, provided making more money is your motivation to go to AU.

Points to consider, but don't take my words as gospel:
- there is a lot of IT jobs in Sydney. Senior roles go from 100K to 150K, with most high-paying ones usually on contract basis in the vendor space. Solution/enterprise architects go from 150K to 180K, although they are mostly 3 to 6 months contract basis. Google for a salary guide in NSW. Can easily find one.
- full time permanent jobs are hard to land, but good people are always in demand, if you can show your value to the business.
- team leadership or architect roles have high requirement for soft skills in an Australian context, and good understanding of the business and a lot of interfacing with stakeholders. This can be a challenge for most Msians (like me). Years of relevant experience in similar roles in MNCs can help you ace that interview, but not necessarily hold on to the job.
- unless you can get internal transfer deals, or somehow get sponsored by an AU company (temporary residency), then it is almost guaranteed you must have permanent residency to score a professional job.
- some companies' HR have equality targets, which include male/female ratio in high ranking posts and diversity. Point is, IT in Sydney is highly diverse, to your advantage, not against.

But you are here for a dose of reality, so... :
- you are still at that energetic age when working long hours per week is child's play. I had been in MY IT industry for more than 10 years to know high paying IT jobs don't come without a price on health. (If you have a stress-free MYR12K/mth job, then chances are your days are numbered). So, looking at the next 5-10 years to make more money through technical jobs, you are looking at either highly-technical team leadership roles or highly-experienced solution architect roles. There comes a point in time when you feel like you should tune down on the rat race.
- while IT professionals in AU are generally conscious of weekly hours worked, high-paying jobs are generally outcome-driven, so you still have to spend as many hours you need to stay ahead. Other than that, better work-life balance is mostly true.
- now, assuming you got the PR, and then got a 150K job, nearing 30 years old or older, are you planning to raise kids soon by then? Will the kids be in MY and you continue working in AU? Or kids will be in AU too? Surely, you can't be considering exchanging 5 years of time with own kids for more money. Lifestyle and childcare expenses to think about.
- chances are you will land on lower paying but still okay jobs, say, 100K (I can hear someone here screaming "did you say 'okay'??"), what then? Need to do your math. There is online expenses calculator in different cities around the world. It's not that bad in my opinion, but it depends what you want out of working in AU. Median AU income is 86K if memory serves.

Edit: not underestimating your capability. I actually meant to say, your FIRST job in AU will likely start at a lower pay than expected job.