Tebow is scheduled to address the Celebration Church in Georgetown, north of Austin. Church spokeswoman Tara Wall told The Associated Press that Tebow reached out to the church about a month ago and said he wanted to speak.
People attending the non-denominational service will sit on lawn chairs and blankets. Wall said Friday about 1,100 volunteers are involved in running the event on the church's 110-acre grounds.
Tebow was traded last month from the Denver Broncos to the N.Y. Jets. He's well known for his strong Christian beliefs and often addresses religious congregations.
Wall says Sunday's service will be like "an outside concert event."