The 22-year-old driver will finish the season with Chip Ganassi Racing, where he began his NASCAR career at 18. Sorenson has 97 Sprint Cup starts with five top-five finishes and 95 starts in the Nationwide Series. He has three wins.
Sorenson will team with Kasey Kahne and Elliott Sadler at GEM.
The team did not announce sponsorship or car number, saying those details would be revealed in the near future.
"Reed is a highly talented driver with a wealth of experience and accomplishments for a 22-year-old," said Mark McArdle, the team's vice president and managing director of competition. "We believe he has a great future ahead of him here at Gillett Evernham Motorsports. He will be a great fit with our drivers, sponsors and employees."
GEM has 15 victories and 27 poles since it began racing full-time in Cup in 2001.
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