diff --git a/runners/spark/job-server/spark_job_server.gradle b/runners/spark/job-server/spark_job_server.gradle
index 500a8ba865b1..b2180ebf70af 100644
--- a/runners/spark/job-server/spark_job_server.gradle
+++ b/runners/spark/job-server/spark_job_server.gradle
@@ -210,6 +210,8 @@ def portableValidatesRunnerTask(String name, boolean streaming, boolean docker,
         excludeTestsMatching 'org.apache.beam.sdk.transforms.FlattenTest.testFlattenWithDifferentInputAndOutputCoders2'
         // TODO(https://github.com/apache/beam/issues/31231)
         excludeTestsMatching 'org.apache.beam.sdk.transforms.RedistributeTest.testRedistributePreservesMetadata'
+        // Spark does not support side inputs in timers (added in #38363)
+        excludeTestsMatching 'org.apache.beam.sdk.transforms.ParDoTest$StateTests.testSideInputNotReadyTimer'
         for (String test : sickbayTests) {
           excludeTestsMatching test
         }
diff --git a/runners/spark/spark_runner.gradle b/runners/spark/spark_runner.gradle
index cd108372fea5..1ae35b7449a4 100644
--- a/runners/spark/spark_runner.gradle
+++ b/runners/spark/spark_runner.gradle
@@ -406,6 +406,8 @@ def validatesRunnerBatch = tasks.register("validatesRunnerBatch", Test) {
     excludeTestsMatching 'org.apache.beam.sdk.transforms.RedistributeTest.testRedistributePreservesMetadata'
     // TODO(https://github.com/apache/beam/issues/32021)
     excludeTestsMatching 'org.apache.beam.sdk.metrics.MetricsTest$AttemptedMetricTests.testBoundedSourceMetricsInSplit'
+    // Spark does not support side inputs in timers (added in #38363)
+    excludeTestsMatching 'org.apache.beam.sdk.transforms.ParDoTest$StateTests.testSideInputNotReadyTimer'
   }
 }