Hello,

Yes, you can do B.Sc after diploma course but it will be a sheer waste of time for you. B.sc will take 3 years and you cannot do much with a B.sc degree but if you will go for lateral entry then you can get direct admission in 2nd year for B.tech  course and a b.tech degree is far better than as B.Sc degree and it will take the same duration of 3 years so its better to do a technical degree rather than simple  graduation. You will have better options in future.Although its still your choice but i gave you a better option.

I hope this helps