To pursue Masters in Psychology, ideally you should have had Psychology as a subject in your Bachelor's degree. You should have also scored a minimum aggregate of 50% in your Bachelors. With B.Tech you might not have had Psychology as a subject and so you cannot pursue M.Sc Psychology full time. But there are Institutions that offer Distance learning and those Candidates who do not have Psychology as a subject also can apply. One of them is IGNOU.