A portable steam sauna includes a collapsible canopy which can be deployed in a use or storage configuration, allowing for easy deployment and transportation. The collapsible canopy has two flexible poles which provide a framework to the collapsible canopy. The collapsible canopy and flexible poles can be secured to a base sheet, which itself is attached to a flat surface such as a massage table. The collapsible canopy and base sheet each have elastic perimeters which allow them to be stretched over a flat surface, similar to how a sheet is fitted to a mattress. The base sheet includes attachment points which interface with the flexible poles and help to secure the collapsible canopy in a use configuration. Steam is supplied to the canopy by means of a steam generator, steam hose, and a steam connector which is inserted through a steam opening on the collapsible canopy.