Sander Thonhauser is a Dutch professional mixed martial artist. He competes in the Heavyweight division. He is a RINGS Holland veteran and has also fought for many other top promotions. His Mixed martial arts debut was on June 29, 1997. Sander has not fought since 2005, where he lost to Murad Chunkaiev by submission on April 3, 2005.
|- | Loss | align=center| | Murad Chunkaiev | Submission (armbar) | | | align=center| 1 | align=center| 2:01 | Utrecht City, Netherlands | |- | Win | align=center| 11âÂÂ8 (1) | Raoulet Salim | KO (knee and punches) | | | align=center| 2 | align=center| 1:29 | Utrecht City, Netherlands | |- | Win | align=center| 10âÂÂ8 (1) | Michael Knaap | KO (punch) | | | align=center| 2 | align=center| 4:45 | Utrecht City, Netherlands | |- | Loss | align=center| 9âÂÂ8 (1) | Ibragim Magomedov | KO (punches) | 2H2H: 2 Hot 2 Handle | | align=center| 1 | align=center| 3:32 | Amsterdam, Netherlands | |- | Win | align=center| 9âÂÂ7 (1) | Ladislav Zak | Submission (guillotine choke) | 2H2H: 2 Hot 2 Handle | | align=center| 1 | align=center| 0:43 | Amsterdam, Netherlands | |- | Win | align=center| 8âÂÂ7 (1) | Olaf in 't Veld | KO (punch) | 2H2H: 2 Hot 2 Handle | | align=center| 1 | align=center| 0:09 | Amsterdam, Netherlands | |- | Win | align=center| 7âÂÂ7 (1) | Ladislav Zak | Decision | Gym Alkmaar: Fight Gala | | align=center| 0 | align=center| 0:00 | Netherlands | |- | Loss | align=center| 6âÂÂ7 (1) | Andrey Rudakov | Submission (leglock) | DF: Durata World Grand Prix 3 | | align=center| 1 | align=center| 0:00 | Zagreb, Croatia | |- | Loss | align=center| 6âÂÂ6 (1) | Marc Emmanuel | Submission (keylock) | | | align=center| 2 | align=center| 0:36 | Amsterdam, Netherlands | |- | Win | align=center| 6âÂÂ5 (1) | Colin Sexton | TKO (cut) | FFH: Free Fight Explosion 1 | | align=center| 0 | align=center| 0:00 | Beverwijk, Netherlands | |- | NC | align=center| 5âÂÂ5 (1) | Lee Hasdell | No Contest | | | align=center| 1 | align=center| 0:00 | Utrecht, Netherlands | |- | Loss | align=center| 5âÂÂ5 | Kavkaz Sultanmagomedov | TKO (punches) | WVC 8: World Vale Tudo Championship 8 | | align=center| 1 | align=center| 2:47 | Aruba | |- | Loss | align=center| 5âÂÂ4 | Zaza Tkeshelashvili | TKO (5 lost points) | | | align=center| 1 | align=center| 4:02 | Japan | |- | Win | align=center| 5âÂÂ3 | Joe Akano | TKO (punches) | | | align=center| 2 | align=center| 0:00 | Amsterdam, Netherlands | |- | Win | align=center| 4âÂÂ3 | Artur Mariano | TKO | FFH: Free Fight Gala | | align=center| 0 | align=center| 0:00 | Beverwijk, Netherlands | |- | Win | align=center| 3âÂÂ3 | Scott Goddard | Decision (split) | | | align=center| 2 | align=center| 5:00 | Heerenveen, Netherlands | |- | Loss | align=center| 2âÂÂ3 | Ruslan Kerselyan | TKO | M-1 MFC: European Championship 1998 | | align=center| 1 | align=center| 0:00 | St. Petersburg, Russia | |- | Loss | align=center| 2âÂÂ2 | Lee Hasdell | Submission (arm-triangle choke) | NOTS 1: Night of the Samurai 1 | | align=center| 1 | align=center| 0:55 | Milton Keynes, England | For the Vacant TFF Vale Tudo Superfight title. |- | Win | align=center| 2âÂÂ1 | Cees Bezems | Submission (scarf hold armlock) | | | align=center| 1 | align=center| 0:58 | Amsterdam, Netherlands | |- | Loss | align=center| 1âÂÂ1 | Vidal Serradilla | DQ | FFH: Free Fight Gala | | align=center| 0 | align=center| 0:00 | Beverwijk, Netherlands | |- | Win | align=center| 1âÂÂ0 | Gerard Benschop | KO (palm strikes) | Rings Holland: Utrecht at War | | align=center| 1 | align=center| 3:04 | Utrecht, Netherlands |