Sport fishing is connected to certain regulations. To float into the water you need next to the rural sport angling permit, depending on the kind of fishing water and the administrator, a permit: http://www.sportvisserijnederland.nl/vispas/english/.
Sea fishery is free. In the fishing zone, the coastal waters and the sea area you need for fishing with rods no fishing permit. In the coastal waters there is a limitation of (maximum) two fishing rods. Fishing with a bob or smelt rig is in the coastal water also free, provided that the fishing law is rested with the state. If someone else owns the fishing law than a permit for bob or smelt rig is obliged.
Sport fishing from the beach of Scheveningen in the North Sea is all year and throughout the day allowed. Be careful when inserting your rod to the other beach and sea users.
To sport fishing in the sea from the beach you will not need a license. To fish in lakes (and other waterways) is a license and a fishing license required. These are available in the tourist office.
So even though sport fishing from the beach is allowed throughout the year, one thing remains; keep account of each other!
You could buy fishing maps of the aquatic sports areas in local tourist offices. You could find a lot of useful information about sports fishing in these.
Order VISpas easily and quickly online: https://www.vispas.nl/
Here you will find a comprehensive overview of all fishing locations: http://www.visplanner.nl/