Hello,

After completing your Civil Engineering course, you can do post-graduation in aerospace engineering. The following institutes are offering this course for civil engineers.
1. IISc, Bangalore
2. IIST,
3. IIT-Bangalore,
4. IIT -Kanpur,
5. IIT- Karghapur,
6. IIT- Chennai.
7..SRM University and many other institutes are offering some seats in aerospace engineering for other branch graduate engineers.

Some college in Kerala are-

1. IIST, Thiruvanantapuram kerala
2. RIET, Kerala
3. ILMCET, Kerala
4. VIET, and some other colleges.

The GATE score is the criteria for admission. So concentrate on GATE score.

Hope this will help you.