All visitors to Australia must have a valid visa to travel to and enter Australia. To explore visa options and get information on visa’s appropriate for you, follow the link below and answer a few short questions.
https://immi.homeaffairs.gov.au/visas/getting-a-visa/visa-finder/visit


While tourist visa is normally handled in a matter of week, allow yourself up to 6 weeks in case unforeseen circumstances arise, such as need for documentation of financing.