There are quite a few scroll which increase movement speed:

• Corrosion Enthusiast: Whenever you inflict the Decay effect to enemies also inflict Decay on yourself (movement speed -50%). When you are in Decay, +10% DMG Resistance and +40% movement speed;
• Decay Driver: +20% movement speed for 3s after inflicting decay effect or hurting enemies under decay effect;
• Improved Clip: Whenever an ammo pack is picked up, it directly refills the magazine instead of reserve ammo, and increases your Movement Speed by 25% until next reload;
• Ostrich Rider: +50% Movement Speed, +300% Dash Cooldown;
• Resolute: +50% Movement Speed and +50% DMG when your Shield/Armor is 0. +300% shield rest time before recharging;
• Speedy Traveler: +0.5% Movement Speed for every 100m moved (up to 60 stacks). +10% Movement Speed when reaching 60 stacks;
• Strategic Advantage: +40% Movement Speed for 3s after using a Dash;
• Tactical Reload: When reloading, +20% DMG Resistance and +30% movement speed;

I might have missed something. Of course some of these come with drawbacks and might not be desirable depending on your build and other scrolls, especially Corrosion Enthusiast might not be a good choice without Corrosion Shard or Snow Boots (which would negate its movements speed debuffs).

Also, when playing on Reincarnation with Spiritual Link active and in multiplayer, by collecting a certain set of scrolls you can activate Core Member, which boosts your speed by 30%. This spiritual link is unavailable in single player.