It should be possible however some immigration offices have refused (from posts in this thread).
Be aware that even if your immigration office refused the 60 to visit wife, you could alternatively obtain the 30 day extension.
Seems you travel out of Oz and also have Thai wife.
Be aware that obtaining a Non O marriage eVisa in Oz provides 90 day stamp and you can obtain a 60 day to visit wife to that permission of stay giving 5 months with one visit to immigration. (wife needs to attend)