In the title compound, C(13)H(13)NO(3)S, the benzene ring of the benzene-sulfonamide moiety is disordered with an occupancy ratio of 0.56 (3):0.44 (3), the disorder components being twisted at and angle of 21 (1)° to each other. The meth-oxy-benzene group is roughly planar (r.m.s. deviation = 0.0144 Å) and the amide N atom is displaced from this plane by 0.090 (6) Å. The dihedral angles between the meth-oxy-benzene group and the major and minor occupancy components of the disordered benzene ring are 54.6 (4) and 62.9 (5)°, respectively. In the crystal, infinite polymeric chains are formed along [100] due to inter-molecular N-H⋯O hydrogen bonding. Weak C-H⋯π inter-actions are also present in the crystal.