  We calculate the spin-averaged $J/\psi$-nucleon scattering length
$a_{J/\psi}$ by directly applying QCD sum rule to $J/\psi$-$N$ forward
scattering amplitude. Our result $a_{J/\psi} = - 0.10 \pm 0.02$ fm, predicts
the possibility of bound states with nuclei, though the force is weaker than
that of the light vector mesons ($\rho,\omega,\phi$)-$N$ cases. Up to
dimension-4 gluonic operators, we evaluate the scattering length with twist-2
contribution, which increases the absolute value of the scattering length about
30%. If we apply $a_{J/\psi}$ to the effective mass of $J/\psi$ in nuclear
matter on the basis of the linear density approximation, it shows very slight
decrease ($4 \sim 7$ MeV) at normal matter density.
