Thanks. Will "Dual intend" make him eligible to travel together? Also can we apply for outland in this case once in Canada? which one is better in our case if he has to travel back to India in 6 months?First thing first, you cannot apply to sponsor him until you have returned to Canada. You are a PR (hopefully, you meet RO) and you can only sponsor while living in Canada. So you cannot submit your application until you come back to Canada.
Since he already has visitor visa, he will most likely allow through the border, his entry would be for "dual intend". Search discussion on that topic and read up.
In this case, you may consider applying inland (if you don't expect him the need to travel out of Canada while waiting for the approval).