Kyushu Ibusuki, Kagoshima
Ibusuki Onsen Sunamushi Kaikan Saraku
指宿温泉 砂むし会館 砂楽
Name in Japanese. Look for this on the sign, or show it to a taxi driver.
Tattoos allowedStated by the facility
Onsen hotel or inn. Hot spring (spring details not checked)

Tattoo rule
Tattoos allowedStated by the facility
What the official page says
Q. 入れ墨やタトゥがある場合、入浴できますか? A. 入浴可能です。ただし、下記のような注意点があります。
In short: The official FAQ says guests with tattoos can use the sand bath and onsen, with some points to follow.
Where it is
Kyushu region, Kagoshima prefecture. About 263 km in a straight line from Fukuoka.
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Rules can change. Check the official page on the day you go. Any paid link is labelled next to the button. We have not visited this bath ourselves.