hi,

see its fine to again go for ppost graduate course after a several year of work experiences, see some of the university provides admission based on entrance score and some of the university shortlisted candidates based on bachelors course and also have interview sessions, since you have long time no link with college type educations you may connect with students or professionals who have done ma course in sports psychology, may discuss about admissions, preparations about entrance tests, also follow the groups in facebooks related with ma course in sports psychology.