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The SN+ ion has been detected for the first time in the interstellar medium (ISM) very recently. The analysis of the physical–chemical conditions of the regions where this molecule has been observed requires accurate collisional rates coefficients with the most common colliders in the ISM. The main goals of this work are to study the collision of SN+ with He and report the collisional rate coefficients for this system. A three-dimensional potential energy surface was developed from ab initio energies at the CCSD(T)/aug-cc-pV5Z level of theory fitted using a procedure based on the reproducing kernel Hilbert space approach. Close coupling calculations were performed, and the rate coefficients for the lowest 27 rotational states of SN+ are reported. Furthermore, the rate coefficients considering the hyperfine transitions are also explored.