The Australian Centre for Astrobiology currently offers two elective online courses in Astrobiology at the University of New South Wales.
Current ACA online courses:
PHYS1160 | Introduction to Astronomy and the Search for Life Elsewhere | Visit UNSW Handbook
BEES6741 | Astrobiology: Life in the Universe | Visit UNSW Handbook
Coming Semester 2, 2018:
BEES6800 | The Science of Science Communication