Can I take a year off during a masters program?
As Bill Barth suggests, you really need to check with your department and institutional policies. Every school, and often departments in the same school, can have very different policies.

The fact that you're a master's student, and therefore presumably enrolled in classes rather than actively conducting research, probably will make things easier, as leaves of absence are less disruptive during coursework than in research (for instance, it's harder to "postpone" a grant for a project to enable a student to take a semester or year off).