Specialization can be in fields such as counseling psychology, clinical psychology, general psychology, organizational psychology, health psychology and school psychology.
References :
http://onlineteaching-degree.com/psychology-degree-online/

You can do
1. Master of science in psychology or
2 .Master of Science in Psychology – Clinical Psychology
3. Educational Psychology
These are the few that I am familiar with.
References :
http://thedegreeexperts.com/sd-master-of-science-in-psychology-%e2%80%93-clinical-psychology-217.aspx