A sanitary module arrangement configured for installation in an aircraft cabin includes a sanitary module, the interior of which is separated by a partition wall from an area of the aircraft cabin adjacent to the sanitary module. A sanitary appliance and a first trolley parking place to accommodate at least one trolley configured for holding supplies for the passengers in the aircraft cabin are provided in the interior of the sanitary module. A second trolley parking place for accommodating at least one trolley configured for holding supplies for the passengers in the aircraft cabin is provided adjacent to an outer face of the partition wall outside the sanitary module. A trolley fastening device comprises a holder system for detachably fastening a trolley parked at the second trolley parking place, wherein the holder system includes a holder attached to the outer face of the partition wall.