Dutch health insurances only cover the cost for psychotherapy, if you had been referred to it by a general practitioner. In case you have a health insurance from another country, it is possible that this step is not necessary.
In any case, if you need to find a general practitioner, please refer to this website (in Dutch) to find one in your surrounding area https://www.kiesuwhuisarts.nl/
Most general practitioner’s offices will be communicate in English, so do not hesitate to just pick up the phone or write them a mail.
Furthermore do many Dutch cities maintain expat centers, generally located in the city center with employees capable of speaking multiple languages and helping you to get the information you need.