Hi javed, 

Yes you are eligible to do journalism course after completing your BSC course but there is no  more gaping to admission in these course.

But try to do any degree/diploma course regarding journalism to understand the course better. If you have to join  in any reputated institute for doing journalism course then you have to qualify a entrance test. That are:

(MU- OET), (BHU- UET). Etc

Hope this answer help you.

Thank you