Direct admission is not possible in different specialisation bsc and bpt both are different undergraduate program amd curriculum.its natural to know your interest lately you should go for BSC after completing your bpt degree by this you have one degree more in your hand also you can leave the course in between to save your precious year.

Lovely professional University do provide lateral entry to bsc course but only for diploma holders .decision is yours make your choice all the best for your future endeavours.