It is necessary for non-Yemeni passport holders to obtain an entry Visa to go to Yemen whether the trip is for tourism or business nature.
There is no Consulates general or Embassy of Yemen in Bangladesh. Alternatively, you can contact your nearest Yemen Embassy which is in India

Embassy of The Republic of Yemen in India
D2/5 Vasant Vihar
New Delhi – India 110057
Tel :+9111-42705723 / 24
Email: info@yemeninindia.com
Website: www.yemeninindia.com/Visa.aspx

Tourist Visa

1. Passport must be singed & valid for at least 6 months beyond intended stay.
2. 2 Passport-type photographs required.
3. Copy of airline tickets or itinerary.
4. Medical Record or doctor’s letter confirming the absence of any contagious disease.
5. If visiting friends or relatives in Yemen, a letter of invitation is required.

Business Visa

1. Passport must be valid for at least 6 months beyond intended stay.
2. 2 Passport-type photographs required.
3. Copy of itinerary or air tickets.
4. A business Letter of Guarantee – Link is required, to be typewritten on your company letterhead and addressed to: “Embassy of Yemen Visa Section/ Washington DC”. The letter should state the purpose of the visit and your business reference in Yemen to be visited.
5. Medical Record or doctor’s letter confirming the absence of any contagious disease.

Other Information
Vaccinations – International Certificate of Vaccination required for Yellow Fever if Arriving from Infected Area within 5 days
Entry restrictions: The Government of the Republic of Yemen refuses entry and transit facilities to holders of Israeli passports, or holders of passports containing visas valid or expired for Israel or any indication, such as entry or exit stamps, that the holder has visited Israel