A Tisbury man who has worked as an assistant boys’ basketball coach at the Edgartown School was arraigned Thursday on three counts of indecent assault and battery on a seven-year-old boy.

School officials said the alleged victim is not a student at the school, but Daniel P. Parker’s arrest by Tisbury police on Wednesday prompted the Vineyard schools superintendent to bar him from all Island schools.

Not guilty pleas were entered in Edgartown district court for Mr. Parker, 59, a resident of Vineyard Haven. He remained free on $5,000 bail, but the Hon. H. Gregory Williams barred him from any unsupervised contact with children and continued an order that he stay away from the alleged victim and his residence.

Edgartown School principal John W. Stevens sent a letter to parents on Wednesday, informing them of the arrest and that Mr. Parker was no longer associated with the school. “To our knowledge, nothing inappropriate has taken place involving this individual at our school,” Mr. Stevens wrote.

“We are treating this unsettling arrest with the utmost seriousness and attention,” he also wrote. “We are working closely with the Edgartown police department to ensure the safety and security of our students.” A check done on all school employees had revealed nothing in Mr. Parker’s background that was troubling, Mr. Stevens said in the letter. Counseling will made available to anyone in the school who requests it, Mr. Stevens said.

In an application for criminal complaints, Tisbury police said the boy complained to a neighbor late last month about Mr. Parker, who was identified as “an informal caretaker.” The reports said Mr. Parker had unsupervised access to the boy “for mentoring sessions” since last September, and contained allegations that he had fondled the boy on at least three occasions.

Outside the courthouse today, Mr. Parker declined comment. His wife Jill added: “Only that Dan is absolutely innocent.”