If I get overall 6 band but any one or two modules with 5 or 5.5 bands, can I get admission in Canada for a Master's degree?

Difficult to say, it xan be accepted if the university is flexible and if your academic standing is strong enough. Please write to them, they will evaluate and suggest as per their rules. If you don't have a very good percentage you should retake. Canadian universities also have foundation courses i