Actually I found a masters degree in digital forensics at Edith Cowan University in Western Australia. The course is offered off campus so you don't need to go to WA if you don't want to.
Study Areas
There is also a Master of e-Forensics and Enterprise Security at Melbourne University which students who complete the graduate certificate in digital forensics move on to.
Master of e-Forensics and Enterprise Security - MCCP
Both courses seem okay, but perhaps it would be better just to stay at Melbourne Uni to complete the graduate certificate and masters. You would have already established a relationship with the lecturers and tutors and you'll possibly get more support. The class times are Friday afternoons and Saturdays so it would allow you to work part-time during the week (since you're looking at 6.5 years of study you'd probably be wanting to work by then).
So it would go like this:
Bachelor of Forensic Science majoring in forensic chemistry (Deakin Uni)
Honours in Forensic Science (Deakin Uni)
Graduate Certificate in Digital Forensics (Melbourne Uni)
Master of e-Forensics and Enterprise Sercurity (Melbourne Uni)
If you really don't like the class times for the masters course then enrol in the Edith Cowan Uni course. If you feel like a change of lifestyle by then you could always move to WA.
Bachelor of Forensic Science majoring in forensic chemistry (Deakin Uni)
Honours in Forensic Science (Deakin Uni)
Graduate Certificate in Digital Forensics (Melbourne Uni)
Master of Digital Forensics (Edith Cowan Uni)