ASL shares an underlying organization with spoken language and has its own syntax and grammar 

ASL is for everyone!
Most preschool and elementary-age children love signing, as it engages their minds and their bodies. They love the movement, rhythm, and flow of sign language. Pairing the fun of signing with music is an excellent activity as well. Researchers have found evidence that sign language supports early literacy skills.

Felzer, L. (1998). A Multisensory Reading Program That Really Works. Teaching and Change, 5, 169-183.

Wilson, R., Teague, J., and Teague, M. (1985). The Use of Signing and Fingerspelling to Improve Spelling Performance with Hearing Children. Reading Psychology, 4, 267-273.