بسم الله الرحمن الرحيم
When the Pork Sandwich portion is separate and someone else looks after it and you have nothing to do with it then you may work in other department of this hotel in the state of compulsion. It is better to look for a job at a place where all the products are halal.
Allah knows Best!
Darul Uloom Deoband
This answer was collected from the official ifta website of Darul Uloom Deoband in India.