It is possible to get an Instructor rating and work in Australia. Just how you get there is a different matter. You can't just walk in and start work straight away. You'll need visas etc. There is a pilot shortage happening in Australia right now.
What Visa can I get? Look here.
https://www.australia.gov.au/informa...tion-and-visas
How to convert a foreign licence?
https://www.casa.gov.au/licences-and...dual-licensing