Hi Sprocket,
There are a few schools in Bali that are likely to be able to support your son and one that actively markets for children with special educational needs. However, these are all private businesses and so it is definitely worth "shopping around" and having a look at each of them before making any decisions. Will the schools let you meet students and teachers as opposed to just marketing staff etc? Consider that when visiting. Ask for a tour and see if you can walk by some classrooms to see the lessons that are being taught in real time. Many schools here will have something to accommodate special educational needs, but these will be of varying quality. I work as a teacher in Jakarta and not Bali, so I can't comment first hand but these are some places to consider in your search:
(1) ProEd Global School:
https://proedschool.com/
(2) Canggu Community School:
https://www.ccsbali.com/
(3) Bali Island School:
https://baliinternationalschool.com/
(4) Green School Bali:
https://www.greenschool.org/bali/
(5) Australian Independent School Bali:
https://www.ais-indonesia.com/
(6) Dyatmika School:
https://dyatmika.org/en/home/
(7) Sanur School:
https://sisbali.sch.id/
(8) Sunrise School Bali:
https://sunriseschoolbali.com/
Good luck and I hope that you are able to find a school that suits the needs of your child. Good luck.
Lee

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