If you're interested in corporate law, or law in general, go get your llb. But if you don't wanna leave your field, I suggest you go for PGD (post graduate diploma) courses. They are usually a year long. And they give you exposure to law related to your chosen stream.
Doing llb now will kinda break your engineering background though. Unless you consider IP law. In that case your BE will serve as a support to your llb knowledge.
Hope this helps