The Beach of Velskola in Notrhern Espoo. The area is owned and maintaines by the  Evangelical Lutheran Parishes of Espoo. I understand that the beach is a "semi-public". 

The Beach of Saarijärvi is located in Northern Espoo, near the border of Vihti. The lake is shallow with a sandy bottom, so it fit to splash around.

The Beach of Ruispelto is on the north shore of Lake Pitkäjärvi. The beach is small but idyllic. This beach is not well known, and it's used mainly people who live nearby.

The Beach of Oittaa is located on the shores of Lake Bodom. The beach is suitable for families with children as it deepens gradually. Actually Oittaa has actually two seperate beaches. Oittaa is the most popular beach in Espoo, and one of the "top beaches" in Helsinki region.

There isn't actually a swimming beach in Nuottaniemi, but there are three small "sandy spots" from within you can get into the sea. So this is not an official or maintained beach. 

Matinlahti beach is located in Matinkylä. The beach is also known as the Beach of Matinkylä. The beach is one of the Finest in Helsinki-region.  

Iso Vasikkasaari (in English freely translated Big Calf Island) is a wonderful outdoor island Espoo, just outside Matinkylä. In the island, there is one well-equipped beach and a few small ones..

On the seaside of Espoo's Suvisaaristo, there is a small beach in a beautiful location amidst the forest. Suvisaaristo is in english Summer Islands.

There are two beacher in the Lake Kaitalampi, maybe five hundred meters of each other.. Here are pictures of the Northern beach.

In the northern parts of Espoo you can find Kaitalampi. In english Kaitalampi means narrow pond. Located in nature reserve Kaitalampi is very quiet and calm place to hang visit.

There are two beaches in Kaitalampi. Actually they aren't "beaches", but more like "places that you can go to swim." Lake is deep and if I remember correctly the correct word in english is crag. 

Welcome to one of a very strange corner of the city of Espoo. From the Soukka Cape, you can find a six-acre recreational area, The area, including the small beach, is run by the city of Kauniainen..

Welcome to one of the finest locations in Espoo. Myllyjärvi (in english Mill Lake, I think) is located in northern Espoo, in the north side of lake Bodom. The area is a nature reserve.

Lippajärvi beach is located on the shore of the small Lippajärvi lake in Viherlaakso, Espoo. The beach is also known as Viherranta.

Sorvalampi is a small lake in northern Espoo. The lake is part of the Nuuksio lake highlands, and it has impressive rocks on its shores.

Kattilajärvi beach is located on the shores of Lake Nuuksio, in the middle of a nature reserve. This is perhaps the most secluded and peaceful beach in the Helsinki Metropolitan Area.

Karhusaari beach is located by the sea at Keilaniemi, surprise, surprise Karhusaari. The historic beach is not very well known, although you can cycle here in minutes from Lauttasaari, for example.

Jupperinranta beach is located on the shore of Lake Pitkäjärvi in Espoo. The beach is small but beautiful. On sunny summer days, it is crowded.

Siikajärvi Beach is located on the shore of Lake Siikajärvi in northwestern Espoo. Siikajärvi is located on the border of three municipalities - Espoo, Vihti and Kirkkonummi.

Hanikka Beach is located by the sea Soukka, in southern Espoo, Finland. The beach is also known as Suinonsalmi beach. Suinonsalmi is an inlet that runs between the isle Suvisaaristo ("Summer Islands") and the mainland Suinonsalmi.