Hi Candidate,

If you are interested in MSc Physics, then you must go ahead with your interest. Complete your undergraduation, then go for MSc physics. Later,  ISRO Centralised Recruitment Board (ICRB) which conducts an entrance exam for the recruitment of vacancies in technical posts/researchers/scientists etc. Check out the pattern, syllabus and clear the exam. Then you will be called for interview, if you qualify that too, then you can join ISRO.

Hope I answered your query, thankyou!