Provided are a stacked image sensor package and a packaging method thereof. A stacked image sensor package includes: a stacked image sensor in which a pixel array die and a logic die are stacked; a redistribution layer formed on one surface of the stacked image sensor, rerouting an input/output of the stacked image sensor, and including a first pad and a second pad; a memory die connected with the first pad of the redistribution layer and positioned on the stacked image sensor; and external connectors connected with the second pad, connecting the memory die and the stacked image sensor with an external device, and having the memory die positioned therebetween.