As an international student, you need a student visa to study in Australia. To obtain an Australian visa, you’ll need to demonstrate your English abilities to the Australian Department of Home Affairs. You can use your TOEFL iBT scores to do this! Just be sure to check the score requirements of the institutions where you’re applying — those requirements may be different than the student visa requirements.
For more information about getting your Australian visa, visit the Australian Department of Home Affairs website.