We report on the effect of Co impurity substitution on the anisotropic transport properties of ${\mathrm{Bi}}_{2}{\mathrm{Sr}}_{2}\mathrm{Ca}{({\mathrm{Cu}}_{1\ensuremath{-}x}{\mathrm{Co}}_{x})}_{2}{\mathrm{O}}_{8+\ensuremath{\delta}}$ single crystals. With Co doping, there is an increase in anisotropy $\ensuremath{\gamma}$ estimated from the scaling of the angular dependence of the in-plane resistivity with reduced field as well as in the out-of-plane resistivity. These results can be quantitatively explained by the two-dimensional Lawrence-Doniach model, if we assume that the anisotropy in the superconducting state is determined by the interlayer coupling just above ${T}_{c}$. The analysis highlights the specific feature in high-${T}_{c}$ cuprates that the effective interlayer coupling depends on temperature.