In the title compound, C23H31NO2S, the geometry of the triiso-propyl-phenyl group is slightly distorted, with elongated C-C bonds at the ipso-C atom, and an S atom which deviates from the benzene ring plane by 0.228 (2) Å. This distortion is caused by the bulky substituents and, in comparison, an unbent geometry is observed in N-toluene-sulfonyl-aziridine [Zhu et al. (2006 ▶). Acta Cryst. E62, o1507-o1508]. π-π inter-actions between adjacent benzene rings [centroid-centroid distance = 3.7928 (11) Å] and are observed.