Yes, sumo in Japan is recognized and supported by law. The sport has a long and traditional history in Japan and has been formalized through various legal and regulatory frameworks. The Japanese government has acknowledged sumo as a cultural heritage and part of the nation's tradition.
The Japan Sumo Association (Nihon Sumo Kyokai), which oversees the sport, operates under these regulations and is responsible for organizing tournaments, managing wrestlers, and promoting the sport. While there isn't a specific law solely dedicated to sumo, its status as a significant cultural practice in Japan is underpinned by various laws and policies that support traditional arts and sports.
In addition, sumo has a unique blend of religious and cultural practices associated with Shinto, further emphasizing its significance in Japanese society.