Nationals of Bangladesh can obtain an Entry (or Transit) Permit for a max. stay of 60 days on arrival.
Entry Requirements
There are a number of key requirements that each traveler to Samoa must meet before they will be granted entry to the country. Each visitor to Samoa must:
1. have a return or onward ticket;
2. possess a passport valid for a minimum of six (6) months after the intended date of departure from Samoa;
3. have a valid visa or permit for entry into the country to which they will travel from Samoa;
4. state their accommodation arrangements, be they holiday accommodation such as a hotel or resort or with family or friends (specifically the village and family name);
5. have documented evidence of sufficient funds for self-support (typically a copy of a bank statement);
6. have no record or deportation from other countries;
7. have no health problems that would pose a risk to Samoa;
8. have no history of criminal charges resulting in a minimum of one year of sentencing; and
9. Not be on any alert or warning lists.
for all information : https://visathing.com/country/samoa/