This paper reports scintillometry of sensible heat flux over a semi-arid grassland in Mongolia. The structure parameter of refractive index measured by the scintillometer were used to compute regional sensible heat flux using Monin-Obukhov similarity (MOS). A comparison with the eddy covariance measurements showed that they are comparable with each other. Detailed analyses suggest that difference between the sensible heat flux measured over different optical paths stems from the surface variability. Results of this study demonstrates the capability of scintillometry to infer regional distribution of the surface sensible heat flux at the scale of kilometers over nonuniform surface.