It may help if you could let us know what city, state, territory or country you are looking to find a space in. Then, if someone on this forum knew of someone who had a space/co-op for rent they could let you know.
You could also search in google - "massage co-op" and the city you are interested in, to check to see if there is a co-op in that place.
As for rooms to rent, you can google the same way, "massage room for rent <insert city, state, territory, country here>".
It sounds like you may have already done both of those ideas though.
I am unaware of an actual Massage Rooms For Rent website, but you could also post your request here: viewforum.php?f=39
--- and if you do happen to locate a site like you are asking about, please take time to list it there.