As per the TISS NET eligibility,

• Candidates with three years Bachelors degree or equivalent in any discipline from a recognised college/university are eligible to apply.
• Candidates studying in three and four year degree programmes should have passed in all the subjects of semester 1 to semester 4 and semester 1 to semester 6 respectively at the time of applying for TISSNET
• Candidates studying in the final year of their Bachelors degree programme are also eligible to apply to all the programmes. 

There is no mention of engineer/non engineer eligibility as such. Therefore you can apply.

You can check rest of the eligibility criteria here.

Good Luck.

Tata Institute of Social Sciences National Entrance Tes ...

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