Yea unless you are a dual citizen I wouldn’t head to Australia. You can request permission but doubt anyone wanting to go for the purpose of tourism would be granted an exemption. Here are their entry restrictions...
https://au.usembassy.gov/covid-19-information/Entry and Exit Requirements:
Australia announced a
travel ban on all non-residents and non-Australian citizens entering Australia that went into effect on Friday, March 20, 2020. Individuals may request exceptions to the entry restrictions
at this link.
The Australian government is
restricting Australian citizens and permanent residents from traveling overseas, with some exceptions. Dual U.S.-Australian citizens and U.S. citizen permanent residents of Australia are not exempt from this rule and may be prevented from boarding flights if they do not meet the exception guidelines. Individuals may request exceptions to the exit restrictions
at this link.
Foreign nationals
transiting through Australia to another country don’t need to apply for an exemption to travel restrictions if they are booked to depart on a connecting flight from the same airport within eight hours and they are not going to leave the airport. If you plan to leave the airport before boarding your connecting flight, or if you will be at the airport for longer than eight hours, you will need to apply for a travel exemption. You can
apply online.
Quarantine Information:
All travelers entering Australia from overseas will be
quarantinedin a hotel or designated facility for 14 days. Travelers are required to undertake their mandatory 14-day self-isolation at their
port of entry. Travelers will be transported directly to designated facilities as determined by the relevant state and territory government (for example, a hotel) after appropriate immigration, customs and enhanced health checks.
State and local authorities are levying fines on individuals not following quarantine and self-isolation guidelines.