In the title compound, C(19)H(21)N(3)O(3)S, the C-SO(2)-NH-C torsion angle is 66.20 (9)°. The dihedral angle between the benzene ring and the essentially planar indazole ring system [r.m.s. deviation = 0.0361 (1) Å] is 72.97 (6)°. The S atom has a distorted tetra-hedral geometry [maximum deviation = O-S-O = 119.30 (6)°]. The crystal structure features inversion-related dimers linked by pairs of N-H⋯O hydrogen bonds. In addition, weak C-H⋯O inter-actions may stabilize the crystal packing.