Melbourne teenager Olivia Rogowska was given the other women's wild card by tournament organizers.
Tomic, national under-18 champion Jason Kubler and Davis Cup player Carsten Ball took three of the four remaining men's wild cards for the first Grand Slam of 2010.
Molik, a former Australian Open quarterfinalist and world No. 8, was the form player in the Australian Pro Tour, winning 37 of 40 matches in her comeback before losing to Jessica Moore in the quarterfinals of the wild-card playoffs last week in Melbourne.
Tomic added the U.S. Open boys' title to last year's Australian Open junior crown.
Organizers had previously granted former No. 1 Justine Henin of Belgium wild-card entry into the women's draw.