South Georgia and South Sandwich Islands is about 477 times smaller than Sudan.

Sudan is approximately 1,861,484 sq km, while South Georgia and South Sandwich Islands is approximately 3,903 sq km, making South Georgia and South Sandwich Islands 0.21% the size of Sudan.
Tip: This to-scale comparison of Sudan vs. South Georgia and South Sandwich Islands uses the Mercator projection, which distorts the size of regions near the poles.
Compare further: South Georgia and South Sandwich Islands vs. Sudan