Durant said before Friday's game against the Golden State Warriors that he appreciates what Goodwin has done for him "but it was time for me to move on."
When he entered the NBA draft in 2007 after his freshman season at Texas, Durant signed with Goodwin's Seattle-based Goodwin Sports Management. Goodwin helped negotiate Durant's five-year, $86 million contract that Durant signed in July 2010.
Durant's picture and name still were prominently displayed on the Goodwin Sports Management website Friday night.
Durant says he hasn't chosen a new agent and that he and his brother will handle those duties for now. Durant says he won't let changing agents affect him on the court.
Sources say Durant is considering signing with Jeff Schwartz, Rob Pelinka or CAA. All three are among the most powerful agents in the business, with Pelinka representing Kobe Bryant and Schwartz counting Deron Williams and Paul Pierce among his clientele.
A CAA representative, speaking on condition of anonymity, denied reports that the agency had secured Durant's services, saying there had not yet been extensive talks between the two parties.
Information from ESPN The Magazine's Chris Broussard and The Associated Press was used in this report.