Porous sintered reaction‐bonded silicon nitrides (SRBSNs) with wide pore channels were fabricated using Si‐additive mixture granules. By increasing the strength through the presintering of the as‐spray‐dried granules, conventional uniaxial pressing was employed for the shaping while retaining the spherical granule morphology. The formation of wide intergranular (≥10 μm) and narrow intragranular (<1 μm) pore channels led to high porosity (≥50%) without the blending of fugitive. Both the widest pore channel (10.4 μm) and the highest permeability (κ = 0.3*10−12 m2) were measured using dm (mean diameter) = 76.5 μm granule.