It is extremely difficult to fill doctor positions in regional areas because any doctor working in a regional town will discover they are the only doctor in town. There is no relief and no support. It is very stressful. Also, if they want to train for a specialty, they need to be on a training programme and supervised. That’s mostly done in city-based hospitals.
If a foreign trained doctor comes to Australia, they have to get their qualifications recognised in Australia. If Australia does not recognise their qualification, they can sit the Australian Medical Council examinations. If they pass, they get provisional registration. They can work in a supervised environment. After completing supervised practice, they get general registration. They would probably choose to work in the city too.