The White Sox released Sims on Sunday.
Sims will part ways with the organization for the second time this season, as he previously elected free agency after the White Sox designated him for assignment in late April. He later re-signed with Chicago but was unable to earn another look in the big leagues after submitting an 8.76 ERA, 2.11 WHIP and 20:14 K:BB in 12.1 innings over 13 appearances at Triple-A Charlotte.