Can we change our field of study for masters in canada? I have a bachelors degree in electronics and communication engineering and am going for higher studies. I want to change my field to computer science for my masters. Is it possible to do that for masters in Canada? I've been working as a software developer for an year now.
Yes definitely. Your master's field doesn't need to be in the same field as your bachelors degree in Canada. Although some programs may have specific requirements. Looking at the University of Toronto's website for graduate school in computer science (https://www.sgs.utoronto.ca/programs/computer-science/) the requirements are:

"An appropriate bachelor's degree with a standing equivalent to at least a University of Toronto B+. Preference given to applicants who have studied computer science or a closely related discipline."