You definitely can apply for medicine with an SAT score. The exception would be Melbourne provisional med as they also require AP scores. Btw the SAT scores translate very very well to ATAR.
I haven't checked for all unis, only these three. USyd/ANU/UWA all require a SAT score of 1480-1500 (out of 1600) to be equivalent to ATAR 99.0. That's like 93 marks/subject versus HSC's 89 for 99.0 so it doesn't seem to convert that well.
> https://sydney.edu.au/future-studen...nt-guide-for-international-qualifications.pdf
> https://www.anu.edu.au/files/resour...student qualifications table - August.pdf.pdf
> If you have completed the US College Board SAT and ACT, you are eligble to apply for entry to UWA.