Greetings,

So you cannot pursue a masters degree in engineering after doing a science degree as mentioned in your question.

If you have completed your bachelor's degree and are interested in engineering so much then you can either do b.tech by clearing and getting a good rank in jee mains and advance examination or you can take admission in a private college.

If you don't want to waste your time doing your bachelor all over again you can take some online course as per your interest level like if you are interested in iot and ml or web development or Android development you can get paid courses online and can mention those in your CV. They will be helpful if you want to pursue engineering for getting into a company.