1) Sociology studies society as a whole. Its primary concern is society and social behavior. Whereas social psychology concerns with individual behavior of man a social being.
2) Sociology deals with social processes whereas social psychology deals with mental process.
3) Sociology and psychology differs in subject matter. Sociology studies social life from different angles. Sociology studies communities, groups and the interactions and interrelationships taking place in it.
4) Sociology studies social forms and structures within which the behavior of man takes place. Psychology or Social Psychology is primarily concerned with the individual and his behavior.