Not 100% sure anymore as I haven't asked any of the new Dentistry students in a few years but a lot of them either end up living at the Lodge (Uni Accom across the road at the Campus Shopping Centre) or at an apartment block just down the road from the University itself. I don't know what the adress is but the apartment block I'm talking about can be seen here on google maps: https://www.google.com.au/maps/search/jcu+cairns/@-16.8225065,145.690747,207m/data=!3m1!1e3
It is about 90% filled with JCU students and the vast majority of them tend to be dental students. Otherwise people tend to get sharehouses out at the northern beaches - trinity park, trinity beach, kewarra beach etc. Clifton beach, Palm Cove & anything further north than that tends to be not as common as there is plenty of new houses for cheap rent in Trinity beach.