I agree this is like some of the larvae in http://lepidoptera.butterflyhouse.com.au/lasi/lasi-cats.html but of the 76 named Australian species in Lasiocampidae, we only know the caterpillars of 20 species. Some of the other 56 species may have caterpillars like this. So please take it into protective custody and rear it to the adult moth for confirmation of the species.