The present invention relates to a polyolefin composition for an interior sheet/film. The polyolefin composition of the present invention for an interior sheet comprises 70 to 99 wt % of polyolefin and 1 to 30 wt % of modified polyethylene terephthalate having a melting point of 130 to 180° C. The polyolefin composition of the present invention is environmentally friendly and has good physical properties such as workability, printing characteristics, and adhesiveness. In addition, sheets having various thicknesses can be produced by extrusion without having to stretch the sheets, and thus the sheets can be used separately or in combination in various application fields.