South Georgia and South Sandwich Islands is about 1.4 times bigger than Samoa.

Samoa is approximately 2,831 sq km, while South Georgia and South Sandwich Islands is approximately 3,903 sq km, making South Georgia and South Sandwich Islands 38% larger than Samoa.
Tip: This to-scale comparison of Samoa 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. Samoa