SFD is a Victorian Spearfishing club that is based in the south eastern suburbs of Melbourne.
Not sure if you were after freediving/spearfishing in VIC, but i can give you some info anyway.
There is also a club based in port fairy that is still in VIC but closer to SA. http://www.shipwreckcoastskindivers.com/
They have a Facebook group and post up stuff there.
There are other Spearfishing and/or Freediving clubs and Facebook groups in Victoria and of course there is this forum (feel free to browse around).
If you were after spearing / Freediving in SA, there is a Facebook group "SA spearfishing".
Might be worth getting onto that to get some dive buddies in SA.
If you come over closer to Melbourne, feel free to come along to our club dives (competitions that accommodate social divers too) or meetings to find local dive buddies.
We also have a dive buddies section on this forum where people post up asking for dive buddies from time to time.
Hopefully this gives you enough info to start.