We present 870 \micron ALMA polarization observation toward the Class II protoplanetary disk around AS 209 , which has concentric , multiple gaps and rings . We successfully detect the polarized emission and find that the polarization orientations and fractions have distinct characteristics between the inner and outer regions . In the inner region , the polarization orientations are parallel to the minor axis of the disk , which is consistent with the self-scattering model . The mean polarization fraction in the region is \sim 0.2 % , which is lower than the expected value when the grains have the maximum polarization efficiency , which corresponds to \lambda /2 \pi \sim 140 \micron in grain radius . In the outer region , we detect \sim 1.0 % polarization and find that the polarization orientations are almost in the azimuthal directions . Moreover , the polarization orientations have systematic angular deviations from the azimuthal directions with \Delta \theta \sim 4 \fdg 5 \pm 1 \fdg 6 . The pattern is consistent with a model that radially drifting dust grains are aligned by the gas flow against the dust grains . We consider possible scenarios of the grain dynamics at the AS 209 ring which can reproduce the polarization pattern . However , the directions of the observed angular deviations are opposite to what is predicted under the fact that the disk rotates clockwise . This poses a question in our understandings of the alignment processes and/or grain dynamics in protoplanetary disks .