[Accessible Japan]

Hello Anita,

Unfortunately, separate showers are few and far between here.   If you are looking for a buddget option, any Toyoko Inn with a Heartful Room Type B has a sparate shower area.

Afterwards, they get a bit more pricey:

• The Prince Sakura Tower
  https://www.accessible-japan.com/hotels/japan/tokyo/minato/high-range/the-prince-sakura-tower-tokyo/
• The Royal Park Hotel Tokyo Shiodome
  https://www.accessible-japan.com/hotels/japan/tokyo/minato/high-range/the-royal-park-hotel-tokyo-shiodome/
• Imperial Hotel Tokyo
  https://www.accessible-japan.com/hotels/japan/tokyo/chiyoda/high-range/imperial-hotel-tokyo/
• Hotel Chinzanso Tokyo
  https://www.accessible-japan.com/hotels/japan/tokyo/bunkyo/high-range/hotel-chinzanso-tokyo/

Also, personally I put a shower chair next to the bathtub and shower there as most of the hotel bathrooms are unit-baths with drains in the floor.  I wouldn’t tell staff you will do that, but it certainly opens up options.

Hope that helps.