Defense attorney Joe Amendola argued in a 30-page court filing that without the delay, he may not be able to represent Sandusky "effectively and adequately."
The 68-year-old former Penn State assistant football coach is charged with 52 criminal counts involving 10 boys over 15 years old. Sandusky has denied the allegations.
Sandusky's lawyer said he wants more time to investigate the case and that he's still waiting for material from prosecutors about the charges.
Judge John Cleland has previously said that he is reluctant to postpone the trial, which is currently scheduled for June 5.
Wednesday Cleland said he may throw out parts of some defense subpoenas. Cleland says he plans to rule quickly on motions by several school districts and government agencies to quash subpoenas served by Amendola.
Cleland says several of the defense subpoenas used an incorrect standard and that he plans to quash only the "unsupportable parts" of the subpoenas.
The charges against Sandusky concern his relationships with boys he met through his charity for at-risk kids, The Second Mile, between 1994 and 2008. Prosecutors say Sandusky sexually abused the kids and also gave them gifts.
Attorneys say some of the alleged abuse happened in the Penn State football team's facilities. The ensuing scandal led to the firing of coach Joe Paterno and the ouster of university President Graham Spanier.
The Associated Press contributed to this report.