Porous materials exhibit exceptional suitability for underwater pollutant purification through selective absorption of water and oil. However, most reported porous materials designed for oil absorption, removal, and reuse lack the selectivity necessary to distinguish between different types of organic solvents. In this study, a sponge-based sensor that is responsive to and capable of distinguishing changes in resistance induced by physical deformation of the conductive layer is presented. The sensor is a Janus-structured porous PDMS sponge fabricated using sugar cube templates. The solvent-absorbing section features 300 µm pores to maximize absorption relative to its volume. The resistance-sensing section was created with 600 µm pores and PDMS mixed with the surfactant Triton X-100 (TX-100) to enhance hydrophilicity, allowing for low-cost dip coating with a water-dispersible conductive polymer poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS). Detecting the physical changes in the PEDOT:PSS film on the sponge surface allowed distinguishing responses to physical stimuli. Analyzing the trends in resistance changes under physical stimuli and in polar/nonpolar solvents, conductivity change mechanisms are proposed. The type of organic solvent absorbed by the sponge can be differentiated using these mechanisms.