Bangladesh is currently open to tourists, as long as they quarantine.
Travelers are required to self-quarantine for 14 days on arrival at a private residence or accommodation. Proof of a negative PCR test, taken within the previous 72 hours, must be provided on departure. Does not apply to citizens. Travelers who have visited or transited a ‘high-risk country’ within the previous 15 days will not be allowed to enter Bangladesh. A list of ‘high-risk countries’ can be found at https://www.gov.uk/foreign-travel-advice/bangladesh/entry-requirements
A stay-at-home order is currently in place and movement outside the house is only permitted for urgent reasons. Face masks are required in public spaces and on public transportation. Restaurants, bars and nightclubs are closed.