The closest beach to Sozopoli (Mainland Halkidiki) is Plagia-Flogita Beach, just 4.3 km away. Ordered by distance from Sozopoli. Photos, map, reviews.
4.3 km from Sozopoli

4.6 km from Sozopoli

9.2 km from Sozopoli

10.0 km from Sozopoli

10.7 km from Sozopoli

12.9 km from Sozopoli

13.9 km from Sozopoli

16.0 km from Sozopoli

20.9 km from Sozopoli

54.2 km from Sozopoli

55.0 km from Sozopoli

55.3 km from Sozopoli

Plagia-Flogita Beach, just 4.3 km from Sozopoli. The rest are listed below, ordered by distance.
Within 15 km of Sozopoli there are 7 beaches, with 21 across Mainland Halkidiki in total.
Based on user reviews: Nea Moudania (★4.0), Plagia-Flogita Beach (★3.8), Portes (★3.8).
The beaches are spread out around Sozopoli. A car makes exploring much easier — local buses and taxis are limited outside peak season.
Sozopoli is on the Mainland Halkidiki side of Halkidiki, in northern Greece. The nearest airport is Thessaloniki (SKG); from there a car is the most convenient way to reach the Mainland Halkidiki villages.