Here I just refer some of the most well known beaches of the island. But there are dreamy beaches in every corner, in every cape, in every golf of thassos, where the green of pine trees is mixed with clear blue. Just get around and stop everywhere. 

Dasilio Prinos, Skala Prinos and Rachoni: Wide and extended (several km) with sand, pine and olive trees
Pachis: Sandy with Umbrellas and beds. One of the best beaches at the West of Thassos
Glifonery: An well hidden beach in a small golf. Just dreamy.
Papalimani, Nisteri, Glifada: Sandy beaches at the north of the island. 
Alyki: Fine, golden sandy beach with trees.
Astris: Sandy beach
Paradise beach: Fine sand, and almost always waves. Just a dreamy beach
Chrysi Ammoudia (golden beach): One of the most famous beaches in the island and in Mediterranean. 
Pefkari: Fine sand, trees
Psili Ammos: Fine sand

Skala Prinou Beach

Pahi beach

Pefkari beach

Paradise beach

Astris beach

Agios Vassilios beach- Limenas