Yes, as long as you are willing to persevere, be flexible and take a longer pathway it's entirely possible. Almost all universities in Australia has a science or biomedical science degree (the ATAR requirements range from 70 to 97 depending on the uni, Unimelb typically requires 85-90) which can lead to a graduate pathway in Medicine as long as uni pick the right subjects (you can do pretty much any degree for many graduate medicine courses as long as you do the required Biology and Chemistry subjects, but a Science degree is more convenient). After completing as undergrad and sitting the GAMSAT (entry exam for graduate medicine) apply for all the graduate medicine courses in Australia, if you desperately want to pursue Medicine, you have to be flexible location wise (although this is difficult if you have co-dependents). Also consider actively pursuing community work in areas you are interested in at Uni of Notre Dame, Wollongong and a couple of other regional universities places high priority on this things and can offset slightly lower grades.
People have taken all kinds of paths to get to Medicine. For instance, completing degrees in completely different areas like Law, Arts or Commerce, doing second undergrads as a result of not doing well enough in their first one as well as some who didn't do too well in school (60-70 ATAR) and took a long pathway. Medicine is certainly not out of your reach as long as you are willing to persevere.