diff --git a/crates/cli/src/main.rs b/crates/cli/src/main.rs
index c7f8482..42d3cd4 100644
--- a/crates/cli/src/main.rs
+++ b/crates/cli/src/main.rs
@@ -70,6 +70,12 @@ struct Opt {
     /// Frame rate of the output SWF.
     #[arg(long, default_value_t = 24.0, help_heading = "Generated SWF Options")]
     frame_rate: f32,
+
+    /// Whether the SWF uses the network sandbox.
+    /// If set, the SWF is allowed to make network requests but cannot access local files.
+    /// If not set, the SWF can access local files but cannot make network requests.
+    #[arg(long, help_heading = "Generated SWF Options")]
+    use_network_sandbox: bool,
 }
 
 fn main() -> Result<()> {
@@ -97,7 +103,11 @@ fn main() -> Result<()> {
         .output
         .or_else(|| opt.script.first().map(|s| s.with_extension("swf")))
         .unwrap_or_else(|| PathBuf::from("output.swf"));
-    let swf = pcode.to_swf(&SwfOptions::default().with_frame_rate(opt.frame_rate))?;
+    let swf = pcode.to_swf(
+        &SwfOptions::default()
+            .with_frame_rate(opt.frame_rate)
+            .with_network_sandbox(opt.use_network_sandbox),
+    )?;
     fs::write(&output_path, swf)?;
     Ok(())
 }
diff --git a/crates/rascal/src/program.rs b/crates/rascal/src/program.rs
index 2bafcee..a3fb8be 100644
--- a/crates/rascal/src/program.rs
+++ b/crates/rascal/src/program.rs
@@ -16,6 +16,7 @@ pub struct SwfOptions {
     pub(crate) stage_y_min: f64,
     pub(crate) stage_x_max: f64,
     pub(crate) stage_y_max: f64,
+    pub(crate) use_network_sandbox: bool,
 }
 
 impl Default for SwfOptions {
@@ -26,6 +27,7 @@ impl Default for SwfOptions {
             stage_y_min: 0.0,
             stage_x_max: 100.0,
             stage_y_max: 100.0,
+            use_network_sandbox: false,
         }
     }
 }
@@ -49,6 +51,11 @@ impl SwfOptions {
         self.stage_y_max = stage_y_max;
         self
     }
+
+    pub fn with_network_sandbox(mut self, use_network_sandbox: bool) -> Self {
+        self.use_network_sandbox = use_network_sandbox;
+        self
+    }
 }
 
 #[derive(Debug, Clone, Serialize)]
diff --git a/crates/rascal/src/swf.rs b/crates/rascal/src/swf.rs
index e97f220..c668936 100644
--- a/crates/rascal/src/swf.rs
+++ b/crates/rascal/src/swf.rs
@@ -6,7 +6,7 @@ use std::collections::HashMap;
 use std::io::Result;
 use std::io::Write;
 use swf::write::SwfWriteExt;
-use swf::{CharacterId, ExportedAsset, Fixed8, Sprite, SwfStr, Tag, Twips};
+use swf::{CharacterId, ExportedAsset, FileAttributes, Fixed8, Sprite, SwfStr, Tag, Twips};
 
 impl<'a> ActionEncoder<'a> {}
 
@@ -38,7 +38,16 @@ pub(crate) fn pcode_to_swf(
         modules.push((format!("__Packages.{}", name), result.output));
     }
 
-    let mut tags = vec![Tag::SetBackgroundColor(swf::Color::WHITE)];
+    let mut file_attributes = FileAttributes::empty();
+    file_attributes.set(
+        FileAttributes::USE_NETWORK_SANDBOX,
+        swf_options.use_network_sandbox,
+    );
+
+    let mut tags = vec![
+        Tag::FileAttributes(file_attributes),
+        Tag::SetBackgroundColor(swf::Color::WHITE),
+    ];
     for initializer in &initializers {
         tags.push(Tag::DoAction(initializer))
     }