He could therefore make his debut in Derbyshire's T20 Blast opener against Lancashireon June 9. In 11 previous Blast outings, Thomson has claimed 10 wickets including a career-best haul of 4 for 35.
"Alex will add good depth to our side for the rest of the season," said head coach Dave Houghton.
"We've been keen to add another spin option, so to sign someone who can also extend our batting lineup is very pleasing.
"He's hungry to come to Derbyshire and impress, he's at an age where he wants to be playing first-team games every week, and he will have the opportunity to compete for a place here across the formats.
"With the hectic Vitality Blast schedule coming up, it's so important to have a lot of options, and bringing Alex in will really enhance our squad."
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