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In light of the observed Galactic center gamma-ray excess, we investigate asimplified model, for which the scalar dark matter interacts with quarksthrough a pseudoscalar mediator. The viable regions of the parameter space,that can also account for the relic density and evade the current searches, areidentified, if the low-velocity dark matter annihilates through an $s$-channeloff-shell mediator mostly into $\bar{b} b$, and/or annihilates directly intotwo ${\it hidden}$ on-shell mediators, which subsequently decay into the quarkpairs. These two kinds of annihilations are $s$ wave. The projected monojetlimit set by the high luminosity LHC sensitivity could constrain the favoredparameter space, where the mediator's mass is larger than the dark matter massby a factor of 2. We show that the projected sensitivity of 15-year Fermi-LATobservations of dwarf spheroidal galaxies can provide a stringent constraint onthe most parameter space allowed in this model. If the on-shell mediatorchannel contributes to the dark matter annihilation cross sections over 50$\%$,this model with a lighter mediator can be probed in the projected PICO-500Lexperiment.

Search for Scalar Dark Matter via Pseudoscalar Portal Interactions: In Light of the Galactic Center Gamma-Ray Excess