The Australian Minister of Health and Aged Care has announced further relaxations effective April 17th, 2022. Now that Australia will also start living with COVID-19, a number of emergency measures will cease to apply, including the requirement to test before travelling to Australia.
However, the requirement for proof of vaccination for international travellers will remain in force. This means that international travellers entering or leaving Australia will be required to provide proof of double vaccination against COVID-19. Also, based on medical advice, travellers must continue to wear a mask during international flights.
Source:
https://www.health.gov.au/ministers/the-hon-greg-hunt-mp/media/australias-biosecurity-emergency-pandemic-measures-to-end