diff --git a/netmap/convert.go b/netmap/convert.go
index e0595929..8325c949 100644
--- a/netmap/convert.go
+++ b/netmap/convert.go
@@ -216,6 +216,7 @@ func (p *PlacementPolicy) ToGRPCMessage() grpc.Message {
 		m.SetSelectors(SelectorsToGRPC(p.selectors))
 		m.SetReplicas(ReplicasToGRPC(p.replicas))
 		m.SetContainerBackupFactor(p.backupFactor)
+		m.SetSubnetID(p.subnetID.ToGRPCMessage().(*refsGRPC.SubnetID))
 	}
 
 	return m
@@ -244,6 +245,20 @@ func (p *PlacementPolicy) FromGRPCMessage(m grpc.Message) error {
 		return err
 	}
 
+	subnetID := v.GetSubnetId()
+	if subnetID == nil {
+		p.subnetID = nil
+	} else {
+		if p.subnetID == nil {
+			p.subnetID = new(refs.SubnetID)
+		}
+
+		err = p.subnetID.FromGRPCMessage(subnetID)
+		if err != nil {
+			return err
+		}
+	}
+
 	p.backupFactor = v.GetContainerBackupFactor()
 
 	return nil
diff --git a/netmap/grpc/types.go b/netmap/grpc/types.go
index e8dc6876..95b0acc4 100644
--- a/netmap/grpc/types.go
+++ b/netmap/grpc/types.go
@@ -1,5 +1,7 @@
 package netmap
 
+import refs "github.com/nspcc-dev/neofs-api-go/v2/refs/grpc"
+
 // SetReplicas of placement policy.
 func (m *PlacementPolicy) SetReplicas(v []*Replica) {
 	if m != nil {
@@ -28,6 +30,13 @@ func (m *PlacementPolicy) SetFilters(v []*Filter) {
 	}
 }
 
+// SetSubnetID sets ID of subnet.
+func (m *PlacementPolicy) SetSubnetID(v *refs.SubnetID) {
+	if m != nil {
+		m.SubnetId = v
+	}
+}
+
 // SetName of placement filter.
 func (m *Filter) SetName(v string) {
 	if m != nil {
diff --git a/netmap/marshal.go b/netmap/marshal.go
index d2521112..b29e7507 100644
--- a/netmap/marshal.go
+++ b/netmap/marshal.go
@@ -26,6 +26,7 @@ const (
 	backupPolicyField    = 2
 	selectorsPolicyField = 3
 	filtersPolicyField   = 4
+	subnetIDPolicyField  = 5
 
 	keyAttributeField     = 1
 	valueAttributeField   = 2
@@ -262,6 +263,11 @@ func (p *PlacementPolicy) StableMarshal(buf []byte) ([]byte, error) {
 		offset += n
 	}
 
+	_, err = protoutil.NestedStructureMarshal(subnetIDPolicyField, buf[offset:], p.subnetID)
+	if err != nil {
+		return nil, err
+	}
+
 	return buf, nil
 }
 
@@ -280,6 +286,8 @@ func (p *PlacementPolicy) StableSize() (size int) {
 		size += protoutil.NestedStructureSize(filtersPolicyField, p.filters[i])
 	}
 
+	size += protoutil.NestedStructureSize(subnetIDPolicyField, p.subnetID)
+
 	return size
 }
 
diff --git a/netmap/test/generate.go b/netmap/test/generate.go
index be07f128..93e2ff38 100644
--- a/netmap/test/generate.go
+++ b/netmap/test/generate.go
@@ -102,6 +102,7 @@ func GeneratePlacementPolicy(empty bool) *netmap.PlacementPolicy {
 		m.SetFilters(GenerateFilters(false))
 		m.SetSelectors(GenerateSelectors(false))
 		m.SetReplicas(GenerateReplicas(false))
+		m.SetSubnetID(refstest.GenerateSubnetID(false))
 	}
 
 	return m