Oz ATC is short and are taking people particularly TMA and TWR rated, but will also consider Enroute places.
Whitelighter isn't totally correct...
To be employed in Oz you must be eligible for permanent residency. There was a short period of sponsored visas for persons not eligible for permanent residency, but these are not currently available. I believe there were two reasons they stopped them, 1) Admission that numbers are short (which they are not "officially" despite all the anecdotal evidence) and 2) they were excluding some 'blacklisted' ex employees (Australian citizens) and giving jobs to foreigners, political hot potato.