https://www.ato.gov.au/individuals/i...ur-tax-return/
Take with a grain of salt of course, but as others have said it comes down to whether you're a "Resident for taxation purposes" which essentially boils down to your ties back to Australia, you need to be able to show them that you've left Australia and have no ties back here, commercial, family etc...
If you become a Foreign Resident in another country that's at least half the battle, the other half then comes down to whether you have income of any sort coming in from Australia (Rentals, Investments etc...), do you still have a permanent abode here? Does your Family (Wive/s, Kid/s etc...) still live here... all those sorts of things.
But as others have said, we're (Mostly) Pilots, not accountants, go see an accountant, get it in writing if you can and preferably after that also get something in writing from the ATO if at all possible to cover your bases.