Do you plan on getting an Australian citizenship? If so, I believe you'll be eligible for HECS-Help, which is a government scheme that lets you defer all of your university fees until you are working and earning above a certain threshold. This is what many domestic university students do, because otherwise tertiary education would not be accessible to them. If you haven't heard of it before, I'd recommend you talk to your parents/school about it.
There are some very hefty scholarships available for high-achieving students, but because of the sheer difficulty of getting them, I wouldn't get your heart set on being offered them. General examples aren't that helpful here, as it depends a lot on which university you want to go to. If you google an university's name and 'scholarships' you might find some more info there.
Good luck!