Sound proofing options?

[Mike]

I am building a slot car racing track for my son. The information I have is to put 1/2" homosote on top of 3/4" plywood for noise reduction. My layout size is 5’4” X 12’. I would like to use something I do not have to seam together like the 4’ x 8’ sheets of homosote. Do you have any other options I can use?
Thanks
Mike