Dear Aspirant

Yes, Definitely you can pursue your further education in abroad after your Btech as Under graduation. 

Firstly you have to decide what are planning to do in which field.

If you want to continue your technical field you can choose MtechM.S 

If you are intrested in Management then you can proceed withM.B.A.

There are several more choices and fields. 

You can decide and start preparing for entrance exams of the selected one. 

There are several choice of exams like GRE, IELTS etc.