Yes M tech course is beneficial for your to get jobs in Indian space research organization. higher qualification gives you more opportunity.
you can apply for Scientist/Engineer posts in ISRO after passing M tech engineering course

The following M.Tech degree holders can work as a scientist or engineer in ISRO:

M.Tech in Geophysics/ Applied Geophysics with First Class with 65% marks above.

M.Tech in Geology/ Applied Geology with First Class with 65% marks above.
M.Tech in Geo informatics / Remote Sensing and GIS with First class
M.Tech in Optics / Applied Optics with First class
M.Tech in Physical Engineering, Engineering Physics, Semiconductor devices, opto electronics with first class
M.Tech in integrated Circuit technology / solid state technology/ Microelectronics/ Micro-fabrication with first class or M.Sc Physic with Physics of thin films technology as specialization with first class with 65% marks or more.

Process to get current jobs of ISRO :
== go on official website of ISRO
==click on job opportunities option given on home page of it
==so you will get list of all current jobs offered by it
==now click on your desired job option and get details about it