The Denmark stopper is keen to alter the terms of a deal which currently has a year left to run as it is reportedly appearance-weighted and the 35-year-old spent most of last season on the bench.
If that is not an option there is a chance Sorensen will ask to leave the Britannia Stadium, but Pulis is determined to hang on to the experienced international.
"We are in a situation where Thomas has come to us about renewing his contract and that is brilliant for us," he told The Sentinel.
"Thomas is a vital member of the squad. We will sit down and talk to him and his agent and hopefully get something sorted out."