Is it true that commerce is having better scope than engineering? Can I get better jobs by opting commerce than engineering?

Yes, you can get better jobs but first, you must have passion about this subject and then sky is your limit.

In my opinion, commerce field is giving good job opportunities as that of engineering.

Yes, it surely has, but never choose a field by considering it's scope to other field. Do what your interests are in, and in this way, you will be successful in your career.