We don't have synonyms for sandsoap yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are hand soap and sandtrap.
(n) :
A kind of soap with embedded grains of sand, giving it a coarse, gritty texture, and used for exfoliation or for scrubbing residue from smooth surfaces such as pots and pans.
(n) :
A kind of soap with embedded grains of sand, giving it a coarse, gritty texture, and used for exfoliation or for scrubbing residue from smooth surfaces such as pots and pans.