Yes, you can easily do Journalism and Mass communication after Bsc. To do further study in Journalism and Mass communications, there is no rule that you have to pass the graduation from a particular stream. All you need is to have 50% aggregate percentage in graduation to take admission in universities for this course. But there are few universities which ask for Bachelor degree in Journalism and Mass communication to be eligible to pursue master degree in these course whereas most of the universities do not see your previous stream of graduation.
To get admission for these courses, again there are few universities which takes entrance exam whereas few takes direct admission.
I hope this information helps you.
All the best!!