You can reach the island of Noirmoutier from Strasbourg by train and coach in 5 easy steps:
1) Take a Strasbourg–Nantes train, with a connection in Paris, from Strasbourg station.
2) Transfer between Gare de l’Est and Gare Montparnasse in Paris (depending on your connection time and preferences, you can get there by metro, bike-share, taxi, etc.
Note: Some direct Strasbourg–Nantes trains (without changing in Paris) are available depending on the season.
3) Your train arrives in Nantes, at Gare Montparnasse departure.
4) Head to the Nantes bus station, located opposite the south exit of Nantes SNCF station.
5) Hop on the Aleop coach line 13, “Nantes – Fromentine – Noirmoutier”. The line stops at several places across Noirmoutier Island: Barbâtre, La Guérinière, L’Épine, and Noirmoutier-en-l’Île bus station (the terminus).
Duration: From 7h06 travel time between Strasbourg station and Noirmoutier-en-l’Île bus station.