Abstract We report a detailed study of superconductivity in polycrystalline SnTaS₂ using electrical transport, magnetization and heat capacity measurements. SnTaS₂ crystallizes in centrosymmetric hexagonal structure with space group P 6 3 / m m c . Electrical resistivity, magnetization and specific heat data suggest SnTaS₂ to be a weakly coupled, type-II superconductor with T c ≈ 2.8 K. First-principles calculations show signature for nodal line topology in the electronic band structure, protected by the spatial-inversion and time-reversal symmetries, that strongly gapped out by the inclusion of spin–orbit coupling. Superconductivity in layered SnTaS₂ with nodal line topological state makes it a strong candidate to be considered for a 3D topological superconductor.