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The show will see contestants working alongside a group of traders as they attempt to win up to £25,000.
Each contestant will be asked up to ten questions by the former Blue Peter presenter, with the option of buying the answer from one of the traders.
"I'm really looking forward to being part of this great new quiz show format," said Jones. "It's going to be a lot of fun to see how the contestants and traders react when big money prizes are up for grabs.
"The lure of money does funny things to people and I expect that there will be fireworks in the studio!"
Sky1 commissioning editor Andrea Hamilton added: "It's fantastic that we have Gethin Jones fronting Sell Me The Answer. This is a quiz show that people will definitely be talking about the next day in the office or at school and Gethin has the perfect mix of warmth and fun."
The show will air this summer on Sky1.
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