diff --git a/lib/sandboxed_module.js b/lib/sandboxed_module.js
index 1cd6743..4718b97 100644
--- a/lib/sandboxed_module.js
+++ b/lib/sandboxed_module.js
@@ -4,7 +4,7 @@ var Module = require('module');
 var fs = require('fs');
 var vm = require('vm');
 var path = require('path');
-var builtinModules = require('./builtin_modules.json');
+var builtinModules = Module.builtinModules || require('./builtin_modules.json');
 var parent = module.parent;
 var globalOptions = {};
 var registeredBuiltInSourceTransformers = ['coffee'];
@@ -157,12 +157,20 @@ SandboxedModule.prototype._createRecursiveRequireProxy = function() {
   var cache = Object.create(null);
   var required = this._getRequires();
   for (var key in required) {
-    var injectedFilename = requireLike(this.filename).resolve(key);
-    cache[injectedFilename] = required[key];
+    // Under Yarn PnP, resolution from a transitive dependency's context may fail
+    // for packages not declared in that dependency's package.json. Silently skip
+    // cache pre-population on failure; the mock will still be injected via the
+    // inject map in requireInterceptor or resolved via RecursiveRequireProxy fallback.
+    try {
+      var injectedFilename = requireLike(this.filename).resolve(key);
+      cache[injectedFilename] = required[key];
+    } catch (e) {}
   }
   cache[this.filename] = this.exports;
   var globals = this.globals;
 
+  // Store the top-level module's filename for PnP fallback resolution
+  var topLevelFilename = this.filename;
   var options;
   if(!this._options.sourceTransformersSingleOnly && this._options.sourceTransformers){
     options = {
@@ -208,8 +216,18 @@ SandboxedModule.prototype._createRecursiveRequireProxy = function() {
       if (request in cache) return cache[request];
       return require(request);
     }
-    // cached modules
-    var requestedFilename = requireLike(this.filename).resolve(request);
+    // Resolve the requested module filename.
+    // Under Yarn PnP, packages can only resolve their declared dependencies.
+    // When sandboxed-module loads a transitive dependency, the resolution context
+    // may not have access to all needed packages. Fall back to resolving from
+    // the top-level module's context (the module under test).
+    var requestedFilename;
+    try {
+      requestedFilename = requireLike(this.filename).resolve(request);
+    } catch (e) {
+      if (this.filename === topLevelFilename) throw e;
+      requestedFilename = requireLike(topLevelFilename).resolve(request);
+    }
     if (requestedFilename in cache) return cache[requestedFilename];
     var sandboxedModule = createInnerSandboxedModule(requestedFilename)
     return sandboxedModule.exports;