  We construct a two-orbital effective model for a ferromagnetic Kagome-lattice
shandite, $\rm{{Co}_3{Sn}_2{S}_2}$, a candidate material of magnetic Weyl
semimetals, by considering one $d$ orbital from Co, and one $p$ orbital from
interlayer Sn. The energy spectrum near the Fermi level, and the configurations
of the Weyl points, computed by using our model, are similar to those obtained
by first principle calculations. We show also that nodal rings appear even with
spin-orbit coupling when the magnetization points in-plane direction.
Additionally, magnetic properties of $\rm{{Co}_3{Sn}_2{S}_2}$ and other
shandite materials are discussed.
