The 25-year-old made 173 appearances for the Stags, scoring 20 goals, since signing in the summer of 2016.Director of football David Sharpe said: “We spoke recently with CJ and his representative regarding his future.
“In those discussions, it was clear that CJ wasn’t going to commit his future to the club. With only a year left on his contract, and following many offers in recent weeks from Blackpool, we felt this transfer was in the best interests of Mansfield Town Football Club.
“CJ leaves One Call Stadium in good regard, with our best wishes and gratitude for his endeavours over the past four years.”
Hamilton, who has joined the Seasiders on a three- year contract with Blackpool having an option for a further year, said the vision of Blackpool attracted hin to the club.
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“I’m really looking forward to the future here and I can’t wait to get started,” he said. “I enjoyed my time at Mansfield, but after speaking to Neil Critchley I knew I wanted to come to Blackpool.
"The vision that the Owner, Board and Head Coach have for the club is hugely exciting and I’m hopeful we can deliver the goods come the end of the season.”
Sources across social media accounts have reported the undisclosed fee to be in the region of £200,000.