ISRO has certain job openings and recruitment going on, so if you are interested in a position of junior researcher and scientist, you can contact ISRO Recruitment department.

Now I am not sure what is the procedure there but you can check ISRO’s site http://www.isro.gov.in/ (not much info is there unfortunately) and try to contat them through thsi address -

ISRO Headquarters
Antariksh Bhavan, New BEL Road
BANGALORE - 560 094, INDIA

Phone: +91-80-23415474 Fax: +91-80-2341 5229/2253
email: info/at/isro.gov.in

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