Salt-water submersion is about the worst kind of liquid damage a non-weather-sealed DSLR can suffer. If the camera was powered on when it was flooded, the chances of restoring normal operation are very low. Salt and sand can quickly cause corrosion and contamination throughout the camera, and even cameras merely exposed to salt spray can be severely damaged.

A fresh-water rinse is sometimes suggested to remove salt, but it does not guarantee recovery, and full disassembly/cleaning is difficult and risky without proper service tools and experience. Drying alone is unlikely to fix corrosion damage.

Realistically, the camera body is likely beyond economical repair. The best hope may be recovering the images from the memory card if the card survived. If the photos matter, remove the card and try recovery separately. For the camera itself, professional assessment is the only sensible next step, but replacement is often more likely than a successful repair after salt-water immersion.