AHPRA, the Australian Health Practitioner Regulation Agency, regulates 16 health professions, including nursing, medicine, pharmacy, and physiotherapy. You must be registered with the relevant national board before you can practise in Australia, separate from any visa you hold.
Registration checks your qualifications, identity, English, and professional history against Australian standards. It runs in parallel with, but is distinct from, the immigration process, and an employer will usually expect registration to be underway before they sponsor a health role.