South Georgia and South Sandwich Islands is about 79 times smaller than Oman.

Oman is approximately 309,500 sq km, while South Georgia and South Sandwich Islands is approximately 3,903 sq km, making South Georgia and South Sandwich Islands 1.26% the size of Oman.
Tip: This to-scale comparison of Oman 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. Oman