Hello Umang.



Yes, you can



There are two cases if you want to peruse aerospace engineering



Case:1



After completing your btech in mechanical/automobile engineering, continue your studies by doing masters in aerospace engineering



Case:2



There is other option while doing your btech you can study aerospace engineering by doingonline courses( in some websites like coursea).You will get paid/free certificate for the course.Which is usefull in future.



Thank you!

Definite you can do Masters in that but it's better you take mechanical as core.