Erotic massage in Minsk is basically dead. Massage studios that offer happy endings get pinned down and stomped by the police. You might find a spot if you ask a taxi driver, or a shady local but don’t get your hopes up.
Independent erotic masseuses advertise on directories such as Belochki (https://b.belochki8.com/). But if you’re looking for sensual massage salons in Minsk you have only very few options. Tamarind (https://tamarind.by/) at Storozhovskaya 6, and Royal Thai Spa (http://royalthaispa.by/) at Revaliucyjnaja 28 are both legitimate Thai studios. You might not get any special service, but when it comes to a genuine relaxing massage, they’re the best in Minsk.
There are rumours about groups of naked, sweaty people, huffing and puffing at some shady spots in Minsk. For sure there are more saunas in the Belarusian capital than massage parlours. Some even have king-sized beds for larger clients that like to nap after their sauna experience. For instance Sauna Lyux (https://sauna-21.business.site/) at Smalienskaja 49 and Maentak U Kuz'Micha (http://www.ukuzmicha.by/) at Botanicheskaya 10 have such facilities available.