Patrick Ewing, Georgetown's all-America center, is one of 57 players who will try out in Colorado later this month for the team that will represent the United States at the Pan American Games in August.

The Amateur Basketball Association of the U.S.A. won't make any announcement on who is trying out until Sunday. But it was learned yesterday that the ABAUSA and the U.S. Olympic Committee expect Ewing to arrive in Colorado Springs on May 19 for the tryouts that will last about four days.

Ewing has said he plans to return to Georgetown for his junior year, and the news of his trying out for the Pan Am Games should dismiss any further speculation about him turning professional by May 14, the deadline for undergraduates to file for the NBA draft. Ewing was not available for comment yesterday.

The players selected for the Pan Am Games, which begin Aug. 14 in Caracas, Venezuela, will be coached by Jack Hartman of Kansas State. Some of the players may be chosen by Norm Stewart of Missouri, who will coach the U.S. team in the World University Games, beginning July 1 in Edmonton, Alberta.

The two international events will give the USOC a chance to see what players might compete for the Olympic team in Los Angeles next summer.

A spokesman for the ABAUSA said the U.S. will send its best team to the Pan Am Games, even though the Soviet Union team is expected to be at nearly full strength for the World University Games.