The BCM20736 is an SoC
The BCM20736S is a SiP module
A schematic which shows the chip internals for both is not included here on the community.
If you are looking for an eval board schematic, take a look at Hardware User Guide (SDK 2.x and TAG3 Board), there is a schematic in the back. Note that the 20736 and 20737 are identical from a HW perspective.
Here's the BOM: TAG3 Development Board Bill of Materials