There are currently many student clubs specifically formed for students in the Faculty of Science. This site is dedicated to them.

BABESOC - Biotechnology and Biomolecular Sciences Student Society
http://www.babs.unsw.edu.au/Current/babesoc.asp
Physoc - Physics Student Society
http://www.phys.unsw.edu.au/physoc/index.htm
SOCS - Students of Chemistry Society
http://www.chem.unsw.edu.au/events/socs.html
PsychSoc - Psychology Students Society
http://www.psychsoc.unsw.edu.au
SUNS - Science @ the University of NSW Society
http://www.science.unsw.edu.au/school/student/club.asp

If you would like to form a new club, contact the Student Guild who manage all the UNSW Clubs and Societies.