After doing BTech, you can join many Research and Development centres as a scientist. Some of such Institutions are like- CSIR, MECHON, TATASTEEL, etcc.. Many R&D companies are there or may join any Good MNCs, which offers R&D Jobs too.
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There is always scope for research in any field. It all depends on your interest. You are very lucky if you know exactly what you want to do in your life, and spend your days dreaming about it or making plans down to the details. If you are very clear about pursuing research in any field because it interests you, then go for it because you can always make a compromise between money and self satisfaction. Here, money will not be your top priority but self satisfaction. Let’s assume that you did not earn well, which happens very rarely after getting a Phd degree, but you will get immense satisfaction from whatever you do in your field. And after 2-3 years of experience in your field you can also earn huge amount.
Engineering also allows for multi-disciplinary research. One can go up to the post-doctoral level. In India, most students opt for jobs after graduation, or they go for higher education abroad. That leaves very few researchers. So opportunities are in plenty in field of research.