If you are on a temporary work skilled visa you will need to have private health insurance.
https://www.homeaffairs.gov.au/trav/stud/more/health-insurance
However, if you’re from certain countries you may be entitled to some subsidized health services under our Reciprocal Health Care Agreements.
https://www.humanservices.gov.au/customer/services/medicare/reciprocal-health-care-agreements