  Moir\'e heterostructures hold the promise to provide platforms to tailor
strongly correlated and topological states of matter. Here, we theoretically
propose the emergence of an effective, rectangular moir\'e lattice in twisted
bilayers of SnS with nonsymmorphic symmetry. Based on first-principles
calculations, we demonstrate that strong intrinsic spin-orbit interactions
render this tunable platform a moir\'e semimetal that hosts 2D hourglass
fermions protected by time-reversal symmetry $\mathcal{T}$ and the
nonsymmorphic screw rotation symmetry $\widetilde{\mathcal{C}}_{2y}$. We show
that topological Fermi arcs connecting pairs of Weyl nodal points in the
hourglass dispersion are preserved for weak electron-electron interactions,
particularly in regions of superconducting order that emerge in the phase
diagram of interaction strength and filling. Our work established moir\'e
engineering as an inroad into the realm of correlated topological semimetals
and may motivate further topology related researches in moir\'e
heterostructures.
