Hello & welcome fellow Victorian.
We don't really have much in the way of "remote" down here in Vic, everything is generally within a days drive.
Only place that springs to mind as being fairly remote/beach
(although haven't been) is Croajingolong National Parkhttp://www.parkweb.vic.gov.au/1park_display.cfm?park=99
Well waddya know, exactly 15 minutes