Hi Sarah
Physio Assistant jobs are very limited in Australia, But is possilble to get a job.
I suppose you can start by deciding where in Australia you would like to base yourself. Get the names of the hospitals in the area and write to the Physiotherapy managers outlining the type of experience you have had, and how long you intend to stay in Australia in the one job. Most physitherapy assistants are trained in by specific course but you can be employed with out doing this course.
Good Luck with it. I'm sure you will love Australia. Where are you from.
Jencat