In-situ sol-gel method was used to prepare TiO₂-coated silica foams by minimizing window (i.e., the part formed by the interconnection of pores) blocking caused from the aggregation of TiO₂ particles during the coating process. Specifically, the coating process employed was achieved by performing sol-gel reaction directly onto the surface of silica foams after penetrating precursor solution through the foams. EDX results showed that TiO₂ particles were evenly distributed onto the surface of inner pores in silica foams, indicating that the coating process employed is likely effective for the surface modification of silica foams with 3-dimensional pore network. Additional characterization tests were carried out to evaluate physical properties (pore structure, crystalline structure, specific surface area, permeability, and mechanical strength) of TiO₂-coated silica foams according to heat treatment temperature (300–1100°C). The anatase phase started to appear at heat treatment temperature of 500°C and had maximum value at 700°C. TiO₂ particles tended to grow with increasing treatment temperature, leading to the change in relevant physical properties (i.e., the decrease in total and open porosity, specific surface area, and gas permeability, and the increase in closed porosity) due to the clogging of micropores (d_p≤2 μm); however, the mechanical strength was enhanced after TiO₂ coating with no significant change with heat treatment temperature.