Carbon materials have different types of voids, namely ordered or disordered pore diameters, interlayers, silt-like pores, and free volumes. In this study, the selective sugar adsorption behaviour of carbon materials with different void types was investigated. Specifically, the sugar adsorption behaviour of nanoporous carbon (NPC) prepared from rice husks was examined and compared with that of commercial activated carbon, polymer-like carbon (PLC), and polyethylene (PE). For this purpose, glucose, sucrose, and maltotriose solutions of varying molecular weights were used. The results indicate that NPC selectively adsorbs sugar due to its unique micropore-filling phenomenon. Additionally, these findings suggest that NPC and related materials have potential for use in medical applications.