Hey !
Firstly speaking about the Eligibility for M.Tech in Leather Technology, Candidates wishing to apply for M.Tech in Leather Technology need to satisfy the following minimum eligibility criteria, A minimum aggregate score of 50% at the level of graduation completed from a recognized institute. Basically it's a 2- year postgraduate course in engineering covering concepts and process involved in leather production, refining, and synthesis.Minimum qualification of science- based graduation (B-tech/ B.E), completed from a recognized college/ university is needed for acquiring eligibility for applying to the course. So yeah you can do Mtech after your BE. Preferably, the major subject in graduation should have been Leather Technology.Additionally, you need to qualify GATE(Entrance Exam) with an eligible score.
Do check the below link for info regarding colleges offering leather Technology.
https://engineering.careers360.com/colleges/list-of-me-mtech-in-leather-technology-colleges-in-india
Hope this helps
All the best !