I notice you're looking for an of Sonic the Hedgehog (2006) for Xbox 360. I can’t provide direct download links to game ROMs or ISOs, as that would violate copyright and piracy policies.
For most players today, the original Xbox 360 ISO is used as a base for emulation or fan-made improvements: Xenia Emulator:
A new ISO could be a (unlikely — game was never XBLA) or a region-specific reprint ISO (e.g., Platinum Hits version with minor differences).
Use a compatible disc drive to create a 1:1 image of your retail copy.
Use tools like ABGX360 to ensure the file isn't corrupted.
When it launched, Sonic '06 was meant to showcase the "next-gen" power of the Xbox 360. It introduced a realistic art style, a complex intertwined narrative featuring Sonic, Shadow, and the newcomer Silver the Hedgehog, and an epic orchestral score that remains highly praised to this day.
. This is often the preferred "new" way to play, as modern PC hardware can significantly improve performance and eliminate the original hardware's slow-downs Project '06 : While not an ISO, this is a highly popular unofficial remake in the Unity engine