The most natural Dutch term for psychedelic facilitator is psychedelisch begeleider. The English loanword facilitator is understood but often feels more abstract in Dutch.
Related terms are narrower or more specific. A tripsitter usually focuses on presence, calm, and practical safety, with less steering of the process. A sjamaan belongs to a spiritual or ceremonial context and is not a neutral modern label.
Psychedelisch therapeut implies someone who offers therapy with relevant training; not every begeleider fits that. For a concise example of how roles are distinguished in practice, see this overview.
Short answer: use psychedelisch begeleider as the default.