We have some knowledge of some ski resorts across Europe and the USA thanks to ski trips we have organised over the years.
Please check the websites of the resorts to get more information about their accessibility and existing adaptive snowsports schools.
Adaptive ski schools we know of
USARC: US Adaptive Recreation Center, Big Bear
Verbier: European Snowsport Adaptive Ski School
Schladming - Official site for Freizeit Adaptive Skiing, Austria