There isn't any!!  If you are thinking of visiting Australia and want to tour by Wing then you may wish to contact one of the dealers listed and see if you can do a buyback deal.

I checked with Garner's Bike Hire in Melbourne after several enquiries and they state that the Aussie market is too small for Wing hire.  They have one Electraglide if you are prepared to do it on a Harley.

Or....

Talk to Club members Mike & Marg McHenry who runs an Australian Tour Company specialising in escorted Goldwing tours.  Web site is here..... Chapel Australian Bike Tours.