I don't go to Deakin but I do physio at Monash and didn't get a say in where I got my placements. That being said, they have mostly been fairly close to me. It depends whether deakin do placements in "clinical schools" (i.e. if they have groupings of hospitals/locations that you get allotted into) or if it's just anywhere. In my course we have clinical schools and I'm in one that has locations mainly near me.
Generally though if you have an absolutely legitimate reason why you can't attend a placement, the placements team should be able to discuss options with you. Being linked in with your unis disability support services is also a big help. And like Aaron said, for financial stuff you can apply for scholarships.
I'd recommend speaking to someone at the uni about your concerns, they'll probably be able to give you the best info