Pictures and video footage from the scene shows Coastguard volunteers, supported by police officers, dealing with the incident.
More than 30 lifejackets and other items of clothing, including shoes, have been found onboard the boat.
The Maritime and Coastguard Agency and Sussex Police have been approached for comment.
It is the second time this week, that a suspected migrant boat has washed up in the area. Coastguard volunteers transported items from a black vessel on the shore on Sunday night. Read more here
1. Migrant boat washes up
A suspected migrant boat has washed up in Shoreham for the second time this week. Photo: Eddie Mitchell SUS-211223-111630001 Photo: EDDIE MITCHELL
2. Migrant boat washes up
A suspected migrant boat has washed up in Shoreham for the second time this week. Photo: Eddie Mitchell SUS-211223-111750001 Photo: EDDIE MITCHELL
3. Migrant boat washes up
A suspected migrant boat has washed up in Shoreham for the second time this week. Photo: Eddie Mitchell SUS-211223-111655001 Photo: EDDIE MITCHELL
4. Migrant boat washes up
A suspected migrant boat has washed up in Shoreham for the second time this week. Photo: Eddie Mitchell SUS-211223-111738001 Photo: EDDIE MITCHELL