The plan is to seek voluntary retirement for 1,500 workers among its 28,000 staff, industry sources told the Edaily website.
HHI also announced its intention to merge its plant division into the offshore business to improve efficiency.
This will take place after current projects are completed.
The shipbuilder, which has been hit by its first strikes in 20 years over pay, has already closed and combined a number of units as it seeks to turn around losses.
