The Thunder will get 7-foot center B.J. Mullens from Ohio State in exchange for point guard Rodrigue Beaubois from Guadaloupe and a future second-round pick.
NBA deputy commissioner Adam Silver announced the trade Thursday night.
Dallas had taken Mullens at No. 24, and Beaubois went to Oklahoma City with the very next pick.
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Mullens averaged 8.8 points and 5.7 rebounds in his only year of college before making an early entry into the NBA draft. Beaubois has been playing in the French Pro A league the past three years after being discovered by NBA player Mickael Pietrus, who is from the same Caribbean island.
The Minnesota Timberwolves have traded second-round pick Nick Calathes to the Dallas Mavericks for a 2010 second-round pick and cash considerations.
The Wolves selected the Florida guard with the 45the overall pick. But with first-rounders Ricky Rubio, Jonny Flynn and Wayne Ellington already coming to a jam-packed roster, the Wolves really didn't have room for Calathes this season.
Calathes has already signed a contract to play professionally in Greece.