diff --git a/spacy/tokens/_dict_proxies.py b/spacy/tokens/_dict_proxies.py
index b10f6d484..bfc867ffa 100644
--- a/spacy/tokens/_dict_proxies.py
+++ b/spacy/tokens/_dict_proxies.py
@@ -33,6 +33,9 @@ class SpanGroups(UserDict):
     def _make_span_group(self, name: str, spans: Iterable["Span"]) -> SpanGroup:
         return SpanGroup(self.doc_ref(), name=name, spans=spans)
 
+    def copy(self) -> "SpanGroups":
+        return SpanGroup(self.doc_ref()).from_bytes(self.to_bytes())
+
     def to_bytes(self) -> bytes:
         # We don't need to serialize this as a dict, because the groups
         # know their names.