The inverse Faraday effect (IFE) (the generation of an effective magnetic field in a material upon irradiation with circularly polarized light) offers a pathway to ultrafast, non-thermal control of spin dynamics. In metallic/ferromagnetic-insulator (NM/FMI) bilayers, IFE-driven spin polarization in the metallic layer can be an alternative to generate magnon excitations in the magnetic insulator which otherwise would be inaccessible with photon energies below the insulator bandgap, but this avenue has remained mostly unexplored. In this work, we investigate the regime of spin-transfer via IFE in Au/YIG bilayers, by means of ultrafast time-resolved magneto-optical experiments. Understanding the mechanism of this spin-transfer IFE in these NM/FMI heterostructures is crucial for several reasons: it elucidates the fundamental coupling between light's angular momentum and collective spin modes at buried interfaces, it enables all-optical generation and manipulation of pure spin currents, and it paves the way toward THz-frequency spintronic devices leveraging the insulator's long magnon lifetimes.