diff --git a/native/core/src/execution/jni_api.rs b/native/core/src/execution/jni_api.rs
index 6dc00e9cf6..d345c33f51 100644
--- a/native/core/src/execution/jni_api.rs
+++ b/native/core/src/execution/jni_api.rs
@@ -618,6 +618,7 @@ fn register_datafusion_spark_function(session_ctx: &SessionContext) {
     session_ctx.register_udf(ScalarUDF::new_from_impl(SparkSec::default()));
     session_ctx.register_udf(ScalarUDF::new_from_impl(SparkRint::default()));
     session_ctx.register_udf(ScalarUDF::new_from_impl(SparkBitShift::right_unsigned()));
+    session_ctx.register_udf(ScalarUDF::new_from_impl(SparkSoundex::default()));
 }
 
 /// Prepares arrow arrays for output.
@@ -1191,6 +1192,7 @@ pub extern "system" fn Java_org_apache_comet_Native_getRustThreadId(
 use crate::execution::columnar_to_row::ColumnarToRowContext;
 use arrow::ffi::{from_ffi, FFI_ArrowArray, FFI_ArrowSchema};
 use datafusion_spark::function::math::bin::SparkBin;
+use datafusion_spark::function::string::soundex::SparkSoundex;
 
 /// Initialize a native columnar to row converter.
 ///
diff --git a/spark/src/main/scala/org/apache/comet/serde/strings.scala b/spark/src/main/scala/org/apache/comet/serde/strings.scala
index 3186818c9c..00b339a195 100644
--- a/spark/src/main/scala/org/apache/comet/serde/strings.scala
+++ b/spark/src/main/scala/org/apache/comet/serde/strings.scala
@@ -730,7 +730,7 @@ object CometFormatString extends CometCodegenDispatch[FormatString]
 
 object CometOverlay extends CometCodegenDispatch[Overlay]
 
-object CometSoundEx extends CometCodegenDispatch[SoundEx]
+object CometSoundEx extends CometScalarFunction[SoundEx]("soundex")
 
 object CometStringLocate extends CometCodegenDispatch[StringLocate]
 
diff --git a/spark/src/test/resources/sql-tests/expressions/string/soundex.sql b/spark/src/test/resources/sql-tests/expressions/string/soundex.sql
index b1892de0ee..3d94980277 100644
--- a/spark/src/test/resources/sql-tests/expressions/string/soundex.sql
+++ b/spark/src/test/resources/sql-tests/expressions/string/soundex.sql
@@ -21,7 +21,41 @@ statement
 CREATE TABLE test_soundex(s string) USING parquet
 
 statement
-INSERT INTO test_soundex VALUES ('Miller'), ('Robert'), ('Rupert'), (''), (NULL)
+INSERT INTO test_soundex VALUES
+  ('Miller'),
+  (NULL),
+  (''),
+  ('Apache Spark'),
+  ('123'),
+  ('a123'),
+  ('Datafusion'),
+  ('Ashcroft'),
+  ('B1B'),
+  ('B B'),
+  ('BAB'),
+  ('#hello'),
+  (' hello'),
+  ('\thello'),
+  ('😀hello'),
+  ('1abc'),
+  ('A'),
+  ('BFPV'),
+  ('Robert'),
+  ('Rupert'),
+  ('robert'),
+  ('rObErT'),
+  ('Müller'),
+  ('Abcdefghijklmnop'),
+  ('Lloyd'),
+  ('BWB'),
+  ('BHB'),
+  ('Tymczak'),
+  ('Aeiou'),
+  ('1Robert'),
+  ('Smith-Jones'),
+  ('#'),
+  ('\nhello'),
+  ('   ');
 
 query
 SELECT s, soundex(s) FROM test_soundex
@@ -29,3 +63,7 @@ SELECT s, soundex(s) FROM test_soundex
 -- literal arguments
 query
 SELECT soundex('Miller'), soundex('Tymczak')
+
+-- additional test for soundex with concat
+query
+SELECT concat(soundex('   '), 'Spark') as concat_spark;