By Agence France-Presse
The coastguard said authorities in the southern state of Johor were alerted at 8:50 am that the vessel, the JBB Rong Chang 8, had sank.
Two boats were sent to the scene and found one Chinese national dead and three others alive, the coastguard said.
A search is continuing for the 14 sailors –12 Chinese, one Indonesian and one Malaysian — still missing, said a coastguard statement.
Sanifah Yusof, a senior coastguard official, told AFP that divers searching for the missing crew believed some could still be alive inside the overturned boat.
“We believe there are some crew trapped in the ship. The divers knocked on the body of the ship and got a response,” he told AFP.
It was not clear what caused the accident in Muar district. The weather in the area was fine.
Dredging sand from coastal areas is a booming and lucrative business. The sand is shipped to wealthy land-scarce areas such as Singapore for reclamation and construction work.
But environmentalists have long argued that the practice damages local communities and ecosystems.
Last year two foreign vessels manned by Chinese crew were seized off Malaysia’s west coast for allegedly conducting illegal sand-dredging.